During this summer holiday I decided to give my 20 month old son his own set of wheels, he had already been eyeing the bigger kids on their cycles for some time and I a summer project to hone my woodworking skills as well. Some internet research got my mind set on a balance bike. As it so happens I had some lumber lying around the house for over a year hoping to put to good use.
This is one of those projects which I almost entirely eyeballed with no pre-determined design or plan. If you have any questions about dimensions I can measure it and let you know. The main raw materials for this project are the 12" wheels, 1/2" X 3" soft wood planks from a pallet (wood unknown), screws and some nuts and bolts (6mm dia). I did not use any nails or glue (except for some shims and spacers) and the entire bike can be taken apart and reassembled whenever required.
And last but not the least enjoy making it with your son / daughter if possible (safely ofcourse). Living in an apartment it was kind of hard to actually hide from him while making it, atleast he learnt a few tool names and how to use a spanner, screwdriver and pliers :-)