There are a lot of ways to trim corner splines, but a sharp bit in the router table probably gives the fastest and cleanest results, assuming you pay attention to grain direction.
You can find more picture of these frames, and other things I build, on Instagram.
Whiteside ultimate pattern bit: https://amzn.to/3oNdFKZ
I’m using a Porter Cable 7518 3 1/4 HP router motor, but I recently learned that Porter Cable has stopped making routers, so that is no longer available.
The lift is an INCRA Mast-R-Lift II.
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