I think this counts as a low-buck project. I needed to replace all my old, crazed leaking ports. Beckson wanted $610 + tax + shipping for the four windows. I bought new acrylic, some 3M mounting tape, and some Dow Corning 791 and made some new ones myself for $160.
1) Give yourself plenty of time. It took me almost four hours per window (although each one did go faster than the last as I got better at scraping the old silicone off, cutting the acrylic, etc.)
2) Make sure you buy enough acrylic to make one or two more ports than you need because I did have one shatter as I was cutting it out.
3) Make sure you order the black Dow Corning 791. I didn't realize it came in multiple colors until I was ready to seal my ports, and then it was too late to send it back and wait to order more.
Here's more details on my blog: http://www.fredfacker.blogspot.com/2...arwind-27.html