Way to go Esteban, sharing ideas is always helpful to the folks following behind us.
When it comes to low cost projects, running with what materials you have at hand always works out best, but is not always the best way to do stuff.
I have 4 units now, so I have a usable set for 4 wheels, but while I am in the mood, I'd like to finish building another 4 units so I can stack them at each wheel if required.
Right now I am out of a couple of sizes of lumber, so I must scrounge around until I find what I need.
I want a pair of 2 units to be slightly taller in height as many hot rods run larger diameter tire at the rear and hence one pair of slightly taller units would help level things up.