I actually built a glass bottom boat for a friend recently. she had an old 10ft aluminum row boat. I cut a 2 foot by 3 foot hole in the floor but left the supports and keel. I used a 1/4 inch thick piece of lexan (that bullet proof plexi glass). all I did to mount the glass in the bottom was use 100 percent silicone and drilled lots (about 100) holes all around the edge of the lexan and hull. I than used fully sealed rivets (normal rivets have a hole through them) to hold it all together. Its been about 2 years now and it still does not leak.
Honestly though if you wait till the water is flat calm (looks like glass) you can see much better into the water and in a much bigger area than you ever could through a small hole in a boat floor.
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