Ammo can build.

I have a 5.56 NATO ammo can on the side of the road a few weeks ago, and I've been working out plans for a PC build inside of it. Hopefully without any outside modification to the can itself.

I've got some parts picked out on pcpartpicker (link below), and a link to a website with data on the ammo can.

I've been very careful about picking the parts, though I may have made some errors, so please forgive me. I want to challenge myself for my second build, instead of just asking for recommendations like my first, (check post history if interested. It'll be from around May last year).

I guess just asking for any advice, pointers, tricks or helpful info on getting started. Also, I need a power supply. I can't seem to come up with a solution to this problem.

I should add, I'm sort of an AMD fanboy, but I'm not against using Intel if the parts are clearly better.

I hope these links work properly.
https://www.midwayusa.com/product/1918169793/military-surplus-ammo-can-50-caliber-11-x-5-1-2-x-7

PCPartPicker part list / Price breakdown by merchant