https://www.instructables.com/id/Use-a-Vacuum-cleaner-to-build-your-own-Skateboard/ try this
wheels from a funiture dolly. peice of wood (dosn't splinter) with ends curved up.
instant skateboard. paint it if you want.
From my experience its cheaper and safer to buy a used one.
Find someone throwing out a pair of roller skates. Detach from the shoe/boot upper part. Screw it on the bottom of a piece of scrap wood. Go crazy. That's how we did it in our day. Good luck.
Agreed...Skate wheels are tricky to ride on though. Probably could buy a skateboard cheap enough to negate making one.
Castors, From Sofas or other FurnitureAnd WoodAnd Power Tools=D