Finished up with the windows for now. To involved without the proper machines.
Especially something that will machine the cope. I had to do it the old school way.
Here is what I started with. It was clamped down to my jointer bed for stability. I made the pencil lines on the quarter round by hand. On the backside where it's flat I used a part that had the profile and just traced it. I watched both sides as I cut.
I used a Japanese pull saw to cut the bottom of the cope which is in plane with the tenon.
Then I used a shim (it's MDF) cut to the proper thickness to start the cut for the curved part of the cope.
After I got my starting cut I removed the clamp and shim and just carefully cut the cope with the standard coping saw. This is the one I use to cope all my crown. It's nothing special, bought it at a hardware store 20 years ago.
When I get to the flat cut the coped section pops out. If I did good I might have to carve a bit off the quarter round of the mating pc. If not I have to carve more or use a curved chisel to dig some of the irregularity out of the cope. Out of the 10 copes I did I had one that was perfect that I had to do nothing to. That was the 2nd to last cope in the job. The rest I had some minor adjustments to make to the cope or to the mating pc. Sure would have been easier with a stub spindle router coping bit.