Yeah plastic to plastic weld.
I did construction for 5 years so I know what you mean. That's why I make my own :p

Even with a circular saw, you can't be off a 1/32". Unless you can get a thicker solvent that fills gaps.
The stuff I have is like alcohol, flows very quick and is almost an instant bond.

If you get anything made up, keep us updated!!

Right now I'm really happy with my flipped tanks.