Widget build questions

I have just bought a 09154 HF frame and will be building a Widget. First off I build guitars and just finished a 2 1/2 year Fine Woodworker course. I have a couple of Bill of Material, BOM, questions and supplier questions. Plywood or another wood type skin, 1/4" with an interior frame good enough? I would like to build this as light as possible. I think I will start one of those free websites right now so you can watch the build. I will post questions here.
Thanks,
Rob
Thanks,
Rob