That sounds like a lot of crap (the 10lb part). For the stones part, Have you considered some hard modeling foam? should allow you to carve it up well, and should hold together decently well.

As for the Hive tyrant sword, I have not seen one sold as bitz since the book hit. everyone and their grandma has wanted them. Good luck and let us know if you find a place for them.

PS, hope you feel better, and get some motivation to get more painting done.

Ya, I often wish catalyst and paroxysm were more spread in the book. Tervigons are high priority targets, and I end up losing my FNP source. And yes, some days if feels like Njal single handedly takes out tyranids.

Honestly I prefer dawn of war sometimes with my blood angels. I run a mostly jumper list, and it allows my mobile units like typhoons and storm raven to reliably come in first turn, while my enemies has to slowly move from their table edge, then my assault squads come in the next turn in a coordinated strike. Hell, give me C&C while I'm at it, it makes no difference to me.

Here is something that NIB had mentioned that I think is a good point. I kind of eluded to it but wasn't trying to say it. All of your math is assuming charging, which is fine. But what if you don't kill it the turn you charge? You're not getting the furious charge bonus from Swarmy anymore and it looked like that was a big feature. Lets say you assault a parking lot, and only immobilize/stun vehicles. You happen to play it right so your raveners live, so on their assault phase you get to attack the tanks that haven't moved. 2ST raveners are at best glancing, and their reroll to hit is useless as you auto hit. Sure it is situational, but it is a place where RC raveners really do come ahead.
The same applies for combats with units, sure they can stack rending hits, but you're rending each turn. They have to stack the rending on different models, and in things like tac squads there are only 3, one of which is the powerfist.

I understand there is a minuscule difference and in the list you made 2ST works just fine. As long as you know what you're doing with it, it really doesn't matter what others say.
Personally I'm tired of ripping arms off of my nids. I started my raveners as 2ST cause I didn't have Rending claws to put on them. Then I got extra bits and changed them out. Then when 5th came around, mathhammer proved that 2ST was better against vehicles, and we didn't have as good of anti-tank back then. Now I'm back to Rending claws cause I want deadly shock troops.

It all depends on the role you need filled. I ran 5 RC raveners today, they did surprisingly better than I thought. Took out a drop pod cause they had nothing else to hit early on. I then assaulted THROUGH COVER, into a 10 man assault squad, with powerfist, and Astorath. And you know what? I won combat, not only that round, but kept them in combat for the following three until some genestealers could help finish them off.

I use mine as shock troops, and they are generally hitting targets that are near full strength with the intent of tying them up. So I want/need RC so they can actually kill a few things and not lose combat by a lot. I do find mine going far out of reach of the rest of my army.
Also I don't run Tyrants, so that effects it.
All I really want is to give raveners boneswords and I would be sooooo happy!

This reminds me of Warriors from last edition, 2ST warriors at S5 were better against vehicles than rending, but rending was better against MEQ.

With Ws5 and 1 pair of talons, Raveners should be hitting about 77% of the time anyways. If you really need to hit more, then give them preferred enemy from SwarmL. Rending claws actually kill marines, not talons.

Personally I would make it 2 x3 Hive guard, and take a squad of ymgarl. they go really well with swarmlord. also keeps the HG squads alive longer. And personally I don't put toxin sacs on stealers, but to each his own. a pretty good list. do the Tyrant guard have lash whips? cause that is needed since Swarmy doesn't.

So I put a little thought into how I would change the list. As you said, those MCs operate as the core. You can't easily change the core without completely reworking the list. The double tyrants are the main point, so they are staying. That is how I would run them sans the HVC but we've been over that. I can't see dropping the Tyrannofexes as being beneficial. They provide too much heavy fire and anti-infantry fire that can't easily be made up else where. That leaves the only drop option as Tervigons. But the rest of the list is built with the idea of tervigons, so we'd have to start serious revamping if we took them out.

It could be my style and the way I want tyranids to work but for me this list is not aggressive enough. or maybe it's simply too defensive. They tyrants are powerful and make great deterrents and counter attack units.....but they do not strike out at the opponent. And you're using your gargoyles as screens instead of shock troops.
Just some thoughts. As I've said, I've used a scaled down list using Primes so I understand a good portion of the concept behind the list.

I read "Biking" and thought motorcycles at first, and for a moment I thought Purg was cool. Then the moment passed and I realized what he meant.
Really? you have trouble with the tyrant guard? I had them dry fit together standing up fine. A little glue and bam! good. Now Hive guard I'm still trying to figure out how best to keep them together with out equal weight of green stuff and pins.

I haven't played my Nids competitively in a while, let me see what I can dig up. http://theback40k.blogspot.com/2010/06/thegravemi...
That is the report of the first few games http://theback40k.blogspot.com/2010/07/battle-of-...
and that is the final game of the tourney with that list.
Keep in mind that is from November. A few things I learned from those games. I needed some more troops, and I almost always give my prime toxin sacs and adrenal glands now. Just in case I need him to attack a MC.

So what point level do you usually play at Purg? I have my blood angels on the painting table, so I'll probably be bringing out the Bugs for a good ole biomass hunt. I'm going to try out some ideas, I'll see how they do.