Glastron sold a crap load of V-156's.
At least 5 or 6 company's made copy's of it's hull.
Very stable for a 15 and half foot boat, at rest you can stand on front bow seat and not tip boat much ...
If you don't like the windshield in your way for fishing , it can be removed.
Biggest deal with old Glastrons and almost any old boat is weak/rotted wood in transom, floor under transom and stringer under that.
Transom is two half inch pieces of plywood nailed together, with one sheet of fiberglass covering it.
Dealer drill's holes for your motor in it and should have seaedl holes with some sort of sealant, even if he did it could have gotten old and let water in and wood rotted.
Poke around back there, also around screw holes for speedo pilot tube and fish finder wiring.
If it's minor rot, people have put large metal plates on inside and out side to get a few more years out of boat.
Some one must have taken pretty good care of that V-156, it look pretty good.
My old 1972 V-156 ...