I get my lines character count, tab to center (or -10, -20 tab) then backspace to the right count. If I think it'll make it look cleaner I sometimes mix a double space in or ignore punctuation marks from my count, I don't mind them hanging past the rest like I would an M.
PS I thought I remembered messing it up right after I started and sure enough if you look at line three of that picture it's pretty out there lol
Yeah, the extra holes I drilled and one of the the sanded sides. Had a decent ridge I had to get rid of on all four sides, the front lip of the side panels kinda have to cram in beside the fan, but, it closes so I'm happy.