First of all, thanks to everyone who replied for all of the earned wisdom. I have been tossing this around for a few days now, doing TONS of research into tank builds, etc. It may seem a bit arcane, but I was thinking I would do the patch job on the bottom pane. But then I was going to take a piece of plywood, epoxy it completely, put it over the bottom, and seal it up as if the plywood was a replacement piece of glass. This way the original glass will only need to hold if the plywood didn't. It seems that with the two layers of insurance, I don't see why this wouldn't be a good opportunity to get into the large tank world at a reasonable cost. FYI final goal is for this to be a FOWLR. Anywho, that's the plan. I would reallllllly appreciate some veterans on here weighing in and letting me know whether or not this is likely to work or if I am setting myself up for a very wet disappointment. Thank you, in advance, for your generous help.
Jeff