The glass used in most bass boats is pleny strong to hold a downrigger, but like what was mentioned before, use a backer plate (I did on my metal boat as well). Bass boats are very stable. They can actually work their trolling motor to a slower troll than my 4 stroke kicker. Besides the funny looks you would get from the purist bass guys, I see no down-side to downriggers on your bass boat. I would think about mounting them near the cockpit not at the back, unless you want to be on your hands and knees all day. You could also figure out a way to build a rail system that bolts or pins into holes on your rear deck, then get rail mount downriggers. Just a thought...