As the topic says.....You would want it to have great torsional strength, and still hold up and be very rigid, but not brittle. Anyone have any suggestions?

 

i can't help you much on the gas choice but i can give you a little info from when i was considering doing this.

one option is to drill small holes( 1/8th in or so) on the seam and filling it in. im told that this is one of the better ways to do it to ensure you actually benifit and not mess anything up. like all chassis mods you "should" do it on a jig, but if you don't just TAKE YOUR TIME. do a stitch here on the drivers side, then a stitch on the pass side, then the same for the rear, etc etc. the point is take your time, if you go too fast or too long in one area you risk heating the thin honda metal up too much and warping it. then you have a whole new rats nest of issues. this method is also nice because if you just weld the seams it will be VERY difficult to get them cleaned and get the weld to sink in to where it will actually help.

from what i have heard, in the end its not worth it. unless your rally racing or otherwise planning to jump and roll the car. this is why i never went through with it. there should be some good archives on this, try searching chassis stitch, or stitch welding, seam welding, etc.

 

Meh...its a lot of work, and prolly for not that big of a reward. A cage would be more effective in the end anyways. THanks for the comments tho.