The plywood part looks good so far. I've done some fiberglass stuff before but not a tank. I would guess it's not going to be all that easy to coat the inside of that tank properly nor will it be very cheap. Fiberglass resin is also pretty toxic stuff and don't forget you'll still have to coat the finished fiberglass with some kind of epoxy paint as it can rot. I considered something similar myself at one point but adding up costs pretty much exceeding the cost of glass so it didn't make much sense to me.
You might also want to consider 15mm starphire front rather than 12mm. Personally I think using 12mm will be a mistake as it will have a noticeable bulge. Even a standard 6ft 230 gallon uses 12mm standard and it's pretty noticeable, going up to 8 feet and softer glass will be much worse.
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