[techtiger1]

This looks like a great start to a solid frame. Driving the back wheels is up to you in the case, I would try both setups. They won't be doing much with the centered wheels being lowered also depending on what type of tread you use 1/8in offset may not be enough. I am going to recommend another thing with this design and that is use #25 chain although it needs to be lined up quite accurately it will save you alot of weight and is fine for FIRST applications. What size and materials were you looking at using for the side plates, wheels, etc?