Erik, Here is a picture of the 4 skates I built last year in various stages of assembly. You wouldn't need the ball bearing and races to get the job done, just some plate, axle material and some bearings. These axles were .750, turned down to a snug fit inside the bearings. All the other steel is half inch. To tease my son, who helped get my lathe home, I sent him a video of his momma pushing the Victor 1640 across the garage by herself without out any effort (he is a competitive weight lifter, she is 5'3" 120 pounds dripping wet).
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At the time that I brought the lathe and mill home, I didn't own a toe jack. I just recently made one. My criteria was to make sure I had enough lift to clear a 4x4 piece of lumber. This 4 ton jack does it no problem.
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These items store easily and its comforting to know that if I need to move any big pieces, I don't have to spend a couple days trying to figure out in my head how to do it.