On Friday, October 30, 2015 at 8:51:41 PM UTC-7, Bill T wrote:

Interesting comment about installing those inspection ports, are clear plastic covers available?
BillT

Polycarbonate sheet (aka Lexan), easy to machine/cut with woodworking tools, hell for stout.

http://www.amazon.com/Polycarbonate-.../dp/B00CPRCQ9E