So, I'll fess up. I did use the fiberglass tub on my build. I WOULD NOT AGAIN. I was following the "build manual" and it said put it in so I did. I my defence it was my first "kitcar" project an I didn't know better. Panel it it alli, you will end up with a nice finished interior. If I did another one I would leave it bare without any carpet just like the racecar.