Sal,
Makrolon is a polycarbonate. I got a piece from interstateplastics.com (12" X 24" X 3/8" for $17, then they added on $15 for minimum charge and another $15 for shipping). I would be interested in hearing where mtcfish got his from. Makrolon is like Lexan (GE's proprietary name for its polycarbonate). It comes with paper on both sides so you can work it without scratching the plastic. I wanted a black shiny surface to match the hardtop electronics door, cabin entry door cover, and tackle door. I also used a table saw to cut mine (interstate wanted an outrageous $300+ to make 4 cuts), and it looked smoother than the factory cut. This poly cuts well and routes well, without edge melting (I used a carbide tipped blade with 3 teeth/inch).