Reply by PPK

I’ve had good luck and think everything looks proportional with 12” uppers and 16-18” deep bases. Board games, larger books, etc still fit fine in a 16” deep cabinet. I think if you go too deep on the bases, you end up with something that looks like a kitchen in your living room.
I stay at 30-32” tall max for the bases. Don’t make your doors wider than 19 or 20”. Especially with raised panel doors. Flat panel are lighter, but they still look funny at wider than 19”. (IMO). Puts a lot of stress on the hinges and door joints too.

Don’t cover up your outlets – cut them in :-)

-- Pete