Well I cut the shelf and sight window last night only to find a big rot hole in the sight window

But all is not lost I put the riser block into the heat box for an hour or so after I cleaned out the hole.

Then mixed up some epoxy got the block from the heat box, now with the block still warm I poured the epoxy into the hole, it took me 2 goes to completely fill the hole as some of the epoxy soaked into the wood adding strenght.

Here is the end result, take into mind that it has only been sanded with 80 grit paper.