1. Yup, the original Issydunnyet did use some lynx tubing for leg uprights. I highly recommend getting a frame kit for most of the bracket stuff, but the lynx tubing is a great addition to a regular frame kit, especially for those uprights. The parts won't line up in CAD, but will be close enough in the real world to work.
2. In addition to comments about not using long legs, I also would avoid mounting lynx tubes between servos (they work great for the servo->ground part of the leg, but not so well between servos as they start to work themselves apart real fast, for instance, I had a lot of trouble with this robot coming apart: http://forums.trossenrobotics.com/sh...5983#post35983)
4. All output is in C/C++ (note: avrgcc is not a full C++ compiler, you get classes, but no new/delete).
On tools, I highly recommend the Aoyue 937+ as a great $50 soldering station (you can get it off Amazon). I'd also recommend trying out a brass sponge as a nice $3 upgrade (http://www.sparkfun.com/products/8964).