In a past life I would consider building my own glass aquarium - the warden forbids such activity now. I used to enjoy those things, but have since realized the time, money and frustration that is never quite calculated correctly beforehand.
As for re-seal... Same thing, I would just buy an off the shelf 75 and drill it like I did this one, but for a better closed loop. Current tank has single intake bulkhead for Oceans Motions that I took offline years ago. Wonderful product and Paul is a great guy, I just don't want to deal with the maintenance of the darn thing.
The problem with most off the shelf aquariums over 75 is the depth. I have 20 inches to work with - 25 max including plumbing. So the external overflow box allows the plumbing to go underneath.
Stand, wall demo, all of that stuff, yeah no problem. But the bigger the project, mess and time, the more I will be treated like Cool Hand Luke...
So the 48" wide taller tank will not set her crazy... but ripping a large portion of the wall down to go wider.... ummm
"BIGGER IS NOT BETTER" repeats the warden at the onset and planning of every project. I nod, but find myself somehow in trouble every time.
The loophole - Tank is in home theater. Paint is no longer made - Sherwin Williams "soft suede" - it was a textured finish that looks like suede leather. There is water damage from 2 different (non tank related) water events (sump pump related). The aquarium wall is the one with damage. So fixing it is on the docket... new drywall - paint match and attempt to add texture (mix in some sand, mud, I dunno).
Also she has been watching the fish a bit here and there.