Walnut's a nice wood. If you can do veneer, you might get out a little cheaper (like if the top was walnut and the sides were going to be something else).
All-wood projects often benefit from having some contrast, thing Walnut and maple, or ash, Light and dark.
Be sure to have some pine scraps lying around for test cuts. That can really help prevent creation of expensive firewood

I've found some really good "idea" books at Half price books, things like furniture designs, etc. I found one book called "400 Wood boxes". Some really incredible designs in there. None specifically arcade, but you're looking for layout ratios, and detailing ideas.