Trasom repair from the outside...

[76GMC1500]

If you're good, you can salvage the glass on the outside of the transom to really cut down on cost and time. When you lay new glass, you can see that you are getting a good bond between the glass and wood. If reusing the old, you're going to have to do some things to ensure you get a good bond. I start by lining up the old glass with the transom and drilling some holes all of the way through. Then, I would wet the new wood out with epoxy, then thicken some with West System 404 and Cover everything. Apply the old transom skin, stick a piece of plywood on top, and draw everything together tight with some bolts. Once everythign dries, you remove the plywood, and all you have left to do is bevel out around where you seperated the skin from the rest of the boat and fill that in as well as the holes you made to clamp everything together. It will save you a lot of time faring and a lot of money on materials.