Nice work on the book cases. Care to share the plans on them?
As for power, I have a video that can help you out.
https://www.youtube.com/watch?v=500QtQlYWygI really enjoy these switched power supplies and it can help on your power bill too.
Don't forget to make breathing room for the consoles too.
Any system that has a fan built in, need to have a good amount of space.
What kind of TV?
Including a CRT in the build?
Are you getting a soundbar?
What kind of A\V switchers?
Any upscalers in the plans? (I would suggest the Retrotink 2X)
https://youtu.be/l48jWIBxgRcMy fave thing in room tours is the System and TV setup. (if you can not tell)
If you need any help or suggestions please feel free to ask. Myself and a few others would be happy to help.