Re: ? on port size
That's a little small for a 12'' l7 ported. They like to have a lot of air to push. If that's all you've got to work with, I may try sealed, then if i'm really not happy, try ported. It sounds like you've got a bunch to learn about box building. Hell, I know NOTHING compared to many on here. i'm good at following plans, but know **** for designing.
If anything, pay someone to make you the plans. I'm sure others will chime in. Google relief cuts for the bend, what i've been doing for storage boxes i've made.
PAST: 1976 International Scout. JVC head unit, pioneer 6x9's, Focal 5.25 comps, and a Kicker S12L7 in 3.25 cubes at 37hz: Crunch PZI 1500.1 amp at 1 ohm. 1/0 throughout.
Replaced the factory 8 track and single 4x7 speaker behind the dash
PRESENT: 95 325TI. JVC HU, 5.25" PG RSD, Sony Xplod 604EQX 4ch built in EQ, 10" MB Quart Discus in custom molded 'glass enclosure
Refs: JLJunkieMX107/ HawaiianBassHed/ bk12321/NightDrifter05/Annao2485/nitro_freak1/tapout/juan_caliente/fasfocus00/TheFiverMan/Louisiana_CRX