[IKE]

Beautiful cad-work. a couple more pointers. Add in somethig to represent your chain paths. In order to get 0.090 as light as 0.060, you have to remove 30% of the surface area. For a 12" x 12" piece, that would be 61 1" diameter holes. Experiment with Poster board and glue to learn how sections create strength. You can print out your designes and glue this to posterboard. You can then literally cut and paste a scale chassis together. A good example to think about is: A piece of 1x1 box with 1/16" wall is lighter and stronger than a piece of 1x1" U-channel with 1/8" wall. You can do this "test" at Home Depot. Grab a couple pieces and give them a twist (not enough to permanently deform them, but enough to feel how rigid they are). Think about why that is, and how that might apply to your chassis design. Keep up the good work!