Hey dude, the wood looks really nice!
Here's some links that may help you:
BOM:
https://bitbuilt.net/forums/index.php?threads/portablizing-bom.367/
This is a large inclusive list of commonly used parts from the bitbuilt community. Do your research on how they're used, what they can be used for. The motto around here seems to be "Don't cheap out initially, buy good quality from the start." or something like that.
Charge and play guide:
https://bitbuilt.net/forums/index.php?threads/building-batteries-with-1-port-play-and-charge.1628/
This guide is a great introduction to batteries in general, and really helps to understand what is safe and what will work best for you.
Don't limit your research to these guides. There are tons of guides and threads on this website that are extremely informative, and are easily sifted through using the search function. The other motto of this place seems to be "Research before you ask". Search Bar, google, you name it.
Can't wait to see how this portable turns out!