Look around in this category you might find some inspiration.
Scroll through this thread from @Sender for how far you can go in custom designing essentially any Deck and maybe you can find something you want to buy.
@eboosted is selling enclosures, battery packs and enclosure deck combos read through the thread and take a look at his shop to what is available.
Please do your reading and research other builds, there are many people here who build bits and parts that I can not link for you now.
At the point where you are able to make your questions a bit more specific you will get more help here.
Have fun, looking forward to what you are coming up with!