Hell yeah! Lots of cool stuff on the page. Here's something I just finished making. Jack stand dollies. Same concept as regular wheel dollies only with these you can still freely move the vehicle while it's torn down. Made the bases out of 1 1/2"x1/8" angle iron and added two 12"x2"x1/8" "out-riggers" on each dolly for more stability. Welded 6 pivoting 2" metal casters to each as well for any discrepancies in the floor. Cost was around $120 for all of them.
If you plan on making some of these, I got the casters off of Amazon for $2 each which was the cheapest I could find them, otherwise everywhere had them for over $4 per caster.
Cut the 1 1/2" angle to 30" and cut out the bends every 7 1/2".
Bent it and welded everything else together gets you one of these!