Re: Walkthru Window
I had the same problem on a 91 Wellcraft that I used to have. Broke both the center walk through and the port side glass.
Your best bet will be to use, clear shatter proof poly-carbonate plastic. Lexan is one brand name. I used a brand called Optix. Just measure the thickness you need from the frame/molding and pick up a sheet from your local Menards/Home Depot type place. Then take a pattern from your frame and cut the plastic to shape with a jig-saw. Have extra blades ready. Poly-carb dulls a jig-saw blade faster than anything I've ever seen.
Poly-carb will bend to the curve of the frame with a little pressure and the clarity is just as good as glass.
Durability is also very good. I sold the boat to a friend so I still see the boat on the water and the poly-carb is just as clear as the day I installed it. No scratching or yellowing at all after 4 years.