To cut these faces, I clamped the piece in the vice such that the lines I scribed were parallel to the vice jaw.

Looks good! I accidentally cut the long face a little too deep, but luckily it shouldn’t effect the calculations or functionality.

The radius part isn’t critical or visible, so I decided to just rough it with a file. It was actually easier than I though. It only took a few minutes, and came out nice and accurate.

After that it was just regular drilling and tapping.

It fits! Woot!

Next I drilled matching holes in the stock.

Here’s the finished Boss. it could use a little cleaning up but it works great. If I had to guess, I’d say this little piece took me 4 hours. More if you include v1. It turns out metal working requires a lot of patience ~.