Here is what I do but I'm Pretty new at this. Cut the car @ 1/4 inch, I cut all the way through it with a scroll saw then top it with 1/32 balsa. (This is my test car so it might look a little different, it's actually a wedge) but you get the Idea. This car without paint weighed .29, I'm thinking without wedge it would be .25 or 26. Look for ways to make it lighter!!
As I sit here I know of a few ways already.
1. reduce to one cross member
2. reduce to no cross members?? I don't know how smart that would be. (some of these guys would know)
3. change all the axles to be closer to the top or bottom and shave at an angle from the front to the back, probably save quite a bit!
4. I use tightbond III, I know I could reduce the amount of glue if I try hard enough! (balsa glue??)
5. The sides are 1/8 I'm thinking I should try 3/32. Again newb here so i don't know yet the minimum could be.
6. maybe cut the whole frame so only 2/8 high, and make it into a wedge to allow the weights to stickup! (top the rails with balsa)
Dang I should have done this before, I'm going in the garage to remake my test car!!!!
Ice