The glass is not even level. I would hard pass.
Also glass on the inside used to be pretty common form of bracing so could be that or could be a repair attempt
Im getting ready to repair a 225gal tank, i have to replace the back panel but this one seems like you would be buying alot of new glass and redoing the entire tank. Unless your up for a huge project and basically building yourself a new tank I wouldn't mess with it. Definitely worth using as a snake cage or something though.
You could prob fill it and it would be fine. It could also split apart and spill. All a matter of willingness to accept the risk. I would never touch a cracked chipped tank over 20 gallons.