I quickly estimated these, but here:
Front and back plates are 4x27
Side plates are 4x34
Middle plate is 4x19
Each long hole is 3x8
Each short hole is 3x4
If that is right, then there are 372 in^2 of 1/2 inch 6061 aluminum on that frame... That means that the frame alone should weigh 18.9 lbs, minus wheels and bolts. Since the AndyMark wheels weigh .8 a piece, they account for 3.2 lbs, and I'll throw a pound in there for bolts.
The whole frame should weigh about 23.1 lbs.
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