Well, whoever said it was doable was right!
Ok, so after looking into it further, and pulling the stock speakers, i was able to wedge the wetsounds in without windshield removal!
It was a pain, but not worse than taking the windshield off.
The stock spkrs on my boat were held in with allen head screws, so that made removal and install easier. Something i learned the hard way; the front and rear fosgate speakers are different.
The screw holes line up on the rears, but not on the dash.
As metnioned before, you DO have to cut dash material to fit the wetsounds. Not much, but definitely some trimming. I trimmed from inside the dash with a small sanding drum on a dremel.
When it came time to drill holes, i used a 90˚ drill, with a cut down bit (cut the back, or you won't have a tip!) to drill the passenger side. Clipped the wetsounds template on the bottom of the modified hole, and drilled the holes out.
On the drivers side, there is significantly less room. Believe it or not, i used my cut down drill bit with NO drill. I spun it by hand, and with the thin plastic, it actually worked!
Took 2 people to get them in, and i left the shipping bumpers on the speakers until i had slid them down the windshield into place. One person pushing down on the dash, the other sliding the speaker in. I also released the vertical windshield braces in the walkthrough to give us a litte more flexibility in the windshield.
I also used some clips on the rear of the screws, to make sure they stay tight. These speakers didnt' come wiht them, but i had some panel clips supplied with some other sets of speakers laying around.
Overall, a pain, but doable.
For reference, these speakers were the XS650, not the shallower XS65's
Feel free to hit me up with any questions!