The scale pads will have holes in them. You adjust the height with an Allen wrench. A threaded rod is in the tube welded to the frame. The threaded rod will turn independent of the base. I haven't really come up with the final solution to that.
This frame will adjust to the widest Sprint kart and the narrowest LTO and the longest road race kart. The width on the front is adjustable, notice the 2 colors of the crossmember there. There's a bar inside those 2 square tubes. The side rails pivot and the crossbar in the rear expands. That rear bar is in 3 pieces, two 1 inch bars fit inside that 1 1/2 inch tube. They mount and swivel on both ends.
The rear pads, along with the side rails, which pivot off the front crossbar, are adjustable to accommodate different wheel bases and widths.
I figure it would take no more than one half hour to assemble or disassemble everything. The adjustable leveling pads would remain attached to the sidebars. The crossbars and tire pads are easy to assemble or disassemble. Leveling everything, while very easy, might take some time. Of course to accomplish this he would need a 4 foot level.
I don't think I want to build this, but I would be willing to sell the plans, all dimensioned, for $50. I'm right now in the process of producing JPEG files. Everything on one CD disc.
I'm working on the dimensioning still.