Thanks for the replies.
I have a built in stand that extends from a window ... pretty much the only space for Mr. T's tank, and in that location I'm limited to 30" width which is why I use the tank size/configuration that I have: it's the biggest capacity tank that fits into a 30" width space. Due to the size restrictions, the tank is 'high' oriented rather than wide and/or low (it's only 12" wide).
After scrupulous Craigslist monitoring, I was able to locate a used tank of the same dimensions as the cracked one for $40 delivered to my building, not a bad deal (it also came w/a hood lamp). New it goes for about $125 plus delivery costs. I haven't set it up yet as I'm awaiting some repair work to take place in my apartment and when that's done, I'll transfer Mr. T. from the Rubbermaid container to the tank. He doesn't look happy in the Rubbermade (he can't see out) and it only has about 5'-6' of water depth. He's a reticent turtle and it takes him some time to adopt to changes and after a few weeks he's still a little skittish in the Rubbermaid. Mr. T likes to swim, he likes to see out, he likes to play, look out the window at the trees and sunshine and sky, he likes to climb on his basking log, and he LOVES to monitor food preparation from atop his basking log where he has a view of the stove top (the tank is in the kitchen). He'll be happy when he's back in his replacement tank.
I did source a place near to me that sells replacement glass:$40 for sheet cut to fit the tank. I removed the old broken glass ... a laborious process. I was considering doing the repair, but then the used tank came up for the same price. The used tank has the plastic cross-brace cut off, so after all the research on glass repair, Ill cut a piece of glass from my old tank and silicone it on as a cross brace. I may even make a glass ramp for Mr. T. to climb onto his new ATBA, and maybe a small glass shelf for him to rest on or hang onto. I'll also, finally, do Version 2.0 of his ATBA, this time with fresh plexiglass. I'll post some pics when everything is done. I think he'll also need a new table top surface for his tank stand as the other one got badly warped and I'm concerned it might stress the tank's bottom and crack it. I've previously had the tank resting on a piece of styrofoam covered in black material to cushion the base.
I do wish I could find a tank 30" long but wider than this one, something like 20" wide. Maybe one day I'll build one from scratch now that I have an understanding of the process. Ideally, I'd like to see Mr. T. in a 65-95 gallon breeder style tank so he could swim more freely.
Lot's of work ahead.
Mr. T when he was younger ... looking stoned, but also like a wise Yoda!