custom enclosure help

hey im looking to build a custom inclosure for my amp and subs. I wanted to give the box a curving smooth look. I was wondering what to use after the box is created to creat smooth curves in areas such as a raised areas where the woofer is mounted. sorry if this sounds confusing i dont really know how to explain it.

Are you talking like raising the woofer above everything else if so fiberglass will work. In fact fiberglass will work for all of it.