Just bought lumber to build 90s themed arcade in my shed

I'm building 90s themed arcade In my shed... but I still want to keep a little workshop area so I'm splitting my shed into 3 rooms including the attic/upstairs.

I've never done construction aside from small things like routing cat6 through the house, so I decided to practice virtually first - I've reconstructed my shed's frame in Blender and added all the lumber that I need to add the second floor. I've also 3d-scanned the current structure and superimposed it in blender so it was a bit easier to see if what I'm doing is sane at all.

Bonus: 3dscan video:

I have a laserdisc collection with a few CRT TVs, Pentium 3 computer with Windows 98, and PlayStation1. I'm also planning on building a few arcade cabinets with emulators.