Thinking ahead on sound system & interior

[MDFarms]

Couple more question while I'm thinking ahead. Is there a thread or can we start a new one with best sound deadining options along with behind or under seat speaker and amp locations? With no rear tank I had a couple idea's but one was too deep ........taking fuel tank cutting center out recessing in and building into speaker box with sound deadining and using filler neck out the original hole or soemething alreay built to fit. Like idea of a good sounding sub and amp behind seat with corner speakers and then under seat forward facing front speakers? If anyone has built my idea above point me in the right direction!

I'm sure many have come up with designs while trying to keep the OEM look BUT with good sound or at least I'm hoping.

Secondly who makes best aftermarket carpet and seat covers? Still looking for nice parchment visors and belts.

Thanks in Advance