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I wonder how you made the O-ring water proofing - in a square box?
A great design resource is Parker Hannifin. They produce the Parker O-ring Handbook (292 pages) which provides detailed engineering design descriptions for various O-ring use.There is a simple technique for rectangular O-ring seals on acrylic housings illustrated here: Post 6: DIY O-Rings for Divers
Here is a direct link to their o-ring handbook https://www.parker.com/Literature/O-Ring Division Literature/ORD 5700.pdfA great design resource is Parker Hannifin. They produce the Parker O-ring Handbook (292 pages) which provides detailed engineering design descriptions for various O-ring use.
Ignore the charts and graphs, look for the illustrated diagrams