Sounds like a plan turtles , I know once silcone is stuck to ply its not coming off without a fight ( I have to take tiles off plywood walls sometimes at work its a nightmare job)
i also just built a diy co2 system via joeys vid for my my gallon works a charm in 12 hours my plants are greener and well better cost me 2 bucks not 200 for a store bought one
Oh yer turtles mite have found you a solution for sticking glass to liquid rubber , google chemlink m1 someone else has built an 800 gal on here for catfish not sure if you saw the thread , but they used this apparently it sticks to glass and liquid rubber like fun