On both my 29.5 and 38 i did this job. It’s really not complicated. It’s all in the prep. Use Dow 795, make sure the tubes are “fresh” and have not been sitting on the chandlers shelf for a long while.
Make sure you clean all, did i mention all the old stuff off. Use Achol as CD says never use acetone on acrylic - it will craze it.
I get my plexi glass cut locally it you need to replace it. The original was flat, it takes the curve over time. When you put it in on the 29.5 I prepped it, did a thick bead of 795 laid in the spot and weighted with bags of sand 9 50 lbs. 4 screws on in each corner with over sized hole in the glass and fender washer under the heads. Two days later i removed the screws, removed the fender washers, replaced the screws back in the holes with a dap of 795. 4 days after that i removed the bags of sand and knifed the seam with a razor blade (horizontal across the window and deck bridging the gap) and presto it looks like you know what you are doing. Hasn’t leaked since.