Thank you HighUintas. I probably didn't take as many photos of that part of the process as I should have, but I will try to explain what I did to fit things together. If I don't make it clear enough, feel free to as questions.
I have taken a few different approaches to fitting and inletting toeplates, that said, the process I used on this build seems to work pretty well for me.
First I file a draft on all the parts of the finial, then position the toeplate to the base end it just touching the bottom inside edge of the buttplate, and the finial is centered on the stock. Then I mark each of the screw holes with a pencil by tracing the inside of the hole.
In a situation such as this I like to locate the center of the holes with a sharp scribe, and push it in enough to make a hole. Then I carefully center punch using the tiny hole as a guide. I find I can get the hole centered more accurately using the scribe, and if the hole is slighly off it can be cheated over in the right direction before center punching.
I like starting the holes with a gimlet as it's path can be corrected a bit in the early stages of making the hole. Using a square can help with the hole alignment - of the hole is properly aligned the screw head will sit nicely in the countersink later. If you don't have any gimlets a drill bit works fine.
I put the screws in snug and then scribe around the finial:
Then I stab in the outline much like in previous posts. When I have a complex form like this with lots of tiny corners, I like to overlap the stabbed lines on the inside corners, to help prevent breaking off the points while removing wood. For outside corners, well, you just gotta be careful. See the circled lines.
Then get in there and start taking wood out.
At the back of the plate I like to gouge out (stay inside the lines) some wood to help speed the wood removal process and set some depth, then file or rasp the wood to depth, keeping the area FLAT and SQUARE as best as you can.
Continue on with the finial inlet then fit the toeplate. at this stage the rear of the toeplate will be somewhat raised by the interference with the butt plate. The deeper the inlet, the more the butt interferes because of it's deep curvature.
So to counter that, I file a bevel on the back of the toeplate to approximate the curve of the buttplate. Don't take too much off.
As I go down with the toeplate, I blacken the bottom of the plate, the edges of the finial, and the bevel at the back. I remove wood where the black transfers. Where the toeplate meets the buttplate, I tap with a rawhide mallet, then file the shiny spots that show interference on the bevel of the toeplate back. You can see the exposed curve on the inside of the buttplate in this photo pretty well.
Tap the toeplate in place when the inletting is complete and check for fitment.
One can get a nice joint with the buttplate with some patience and careful filing. As you can see in the photo I like to mark my screws and keep them with their respective holes as they are all a little different.
The screws will tend to raise the wood around their holes, so when something needs to lie perfectly flat against the wood, I slightly countersink the wood in the screw holes.
I find the countersinks in the metal go faster if you countersink on a scrap board, and try fit the screws until they are very close to fitting whils still off the stock - it reduces the number of times you have to go in and out with the screws.
Re-attach the plate, file the screw heads, the draw file the whole thing until it is all even. The buttstock will have to be re-contoured to the width of the toeplate as indicated.
HighUintas, I will get a better photo of the butt-toe joint area and post it soon.
Next up: Wedge escutcheons.
Thanks to all of you who are keeping up with this looooong thread!
Curtis