You're building it with ABS? Wow! I'm thinking that's a great idea. I've been laboring with the idea of making one in FRP. How thick is the ABS?
Although I might suggest Makrolon rather than Isenglass or Strataglass. You'll be amazed at the clarity due to the semi rigidity. Holds up MUCH better too.
I am going to keep my front and sides in canvas
with the sewn in Makrolon so they can be removed easily when I want the air flow. They attach to the deck
with kettering and track so as to have a clean attachment that won't allow water