The tractor is a '52 Ferguson TEA20. Up here we got the British made ones made by the Standard Motor Company (later Triumph), instead of the TO20 with the Continental engine, but they look the same.
Anyway, dimensions. It's all 3 x 3 x 1/4" angle iron, because my brother gave it to me. If I were doing it again I would use 2 x 3" to save weight (if I could get it for the same price) but then I would have to scratch my head to figure out which way to put them. It would be worth it though - it would save around 40 pounds.
There are three pieces 6' long, 4 pieces 3' long, and four pieces 30" long, for a total of forty feet. The base would be 6' x 3' but the way I made it I lost 3" at the inside corner so it's 6' x 33". The 30" pieces are for the vertical part. The two middle vertical ones are spaced 26 1/2" apart but that was a bit much - there is about a 1/2" shoulder on each pin, so the lift arms are about 27" apart. It doesn't sway much, but it's harder to hook up.
For the floorboards, I sorted through rough cut oak. Where the 6' long 1/4" thick angle iron is on top of the four "floor joists", I used 1"x3" boards, and between them I used 1 1/4", so they all would end up flush. Boy that's hard to explain. Anyway they are just bolted down with carriage bolts.