Just about finished with the balance bike build for my kid, should easily be ready in time for Christmas.
Made from 12mm CD Ply & stainless steel bits & pieces. Wheel are the Strider Ultralights you can get off Pushy's for about $20 each.
Still have the seat left to upholster, add some grips (I'm thinking some light rope), bar ends and a coat of paint to finish it off.
If anyone's interested, I did up some plans in CAD for each piece based on another design I found online to produce the templates. All prints 1:1 on a sheet of A1. I've got a few tweaks to make from things I encountered through this, but overall I think the process went pretty well.
The little guy seems to like it, he keeps walking off with the thing while I'm trying to finish it! Just about the right height, and the seat is adjustable (with a few more drill holes) for when he gets a bit bigger.