walk-thru or pass thru

I have a 2000 GMC Sierra reg cab.Looking to build my own custom box for my truck.I was thinking of a walk thru for a port for the box.I have 4 12" JLW0(old school) powered by 1 JL 500/1 Mono.I used to have this system in my S10 and this set up bumped. Not to brag but people said they couldn't breathe when they sat in my S10.I miss the bass and want it in my GMC now.Just looking for some help,info and how to pics.Anything will help.I was at one time willing to pay someone but he backed out at the last minute.

do you plan on keeping this truck? if not, i wouldnt cut a hole in the back. if anything do the breeze through, not the walk through. i had a breeze through in my mazda, but then again, it was a $800 truck

yeah i wouldnt do a "walk thorugh" for that just cut enought for the box to pass through the back wall and just make sure u measure once and cut like 6 times before u get it rite. If you do it post dem pics!

decided to do neither.went ahead and built a box for my 4 12's that slips right behind my seats.