It isn't rocket science. I've made two roller stands for my '39 cab and now my '49 cab (it just rolls around the shop floor). It's not real hard if you just apply a little common sense -- measure the width of the frame (where the cab mounts). Set two 2x4's or 2x6's on the shop floor set at the same widths, put stringers between 'em. Put casters on the bottom and carpet strips along the top and you're done.
I got a little fancy with my last one -- put double stringers (like a pallet) so I could lift the whole thing with the forklift (forks on the skidsteer).
You're only limited by your own creativity and common sense.
Good luck!
John
