Thats a seriously cool looking bot, nice CAD work. Reminds me of Mute a little bit with the shape and barbs on the top.

Good luck with building it if your going to. If you ask around people will be able to help you lot with getting a pneumatic system sorted out. Hope to see it around some day, it seems like a pretty dceent design.

To answer your questions, Ive not seen the Chaos team around for a long long while. There are plenty of places you can pick up materials, so dont worry about that. If your on a restricted budget, then polycarbonate is handy as well and you can get it pretty cheap. If you look in the for sale thread you might just pick up some bargains.

I beleive GT Electronics have a website somewhere where you can order speedos, but I highly recommend going for either the IBC or SideWinder controllers if they are affordable. If not, Id suggest using the Electronise ones. H5 are a bit out dated these days I beleive.

CO2 bottles can be found plenty of places round here. Mario can do you some full pneumatics fairly cheap as a whole set if thats what your looking for. If your starting basic you could even try a compressor system.

Featherweights are a great way to start out. You can get plenty of help with building them, and they are pretty cool little things. Myself, Ive been out of the scene for a while so Im not so up to date, but Ive built my own featherweight and I hope I can help whenever I can. Just get in touch with me if you need and help.

Good luck!