stretch the leather inside and then staple it as well as glue it. stretch it around our rounded port and then trim it and that will depend on where where you place the insert. If the insert is placed higher you could stretch the leather inside the port.
or at least on the rim.
but you may have to tack it on the inside of the rim of the port with tacks so when it tightens it will not pull away from the port.
I don't know how that would work at the port after time though.
I have done some Upholstery in the past but never fastened anything like that.
The sub itself would hold the Upholstery and the port was a plastic insert. most of all my stuff was ported with a round port insert.
Man!  lately this stuff is bringing back memories I remember covering a 6th order that I didn't even know was a 6th order about thiry years ago.
Sob* Im old  :( I never bothered with audio for nearly 20 year until the last few)
blah blah blah blah

the 'beast'

the amp, x-over and amp rack

the finished monster db-10

pic of the guts and the way i sealed the insert

yeah, i'm not going to use gobs of power. but it's hardcore


soon to come...pics of the wo, the 'beast' in action and some comparison pics.

thanks.
2" mdf baffle. 1" mdf walls. i hope it won't vibrate. but if it does, the bottom panel is removable
still thinking about what to add below the x-over in the rack. something just for decorative purposes.


current sub setup :

it would only cool the asorted crap in the storage space
but it would look nice to have a wooden grill. just need to find the stuff we used to stain the wood, because there are plenty of leftovers wood pieces in the attic.