So here is the little bit of joy that is next on my hit list: the saw frame for the Chevalet.

The saw frame — I rendered the CAD model using different materials for the arms and the back to show the joinery more clearly
It’s not really a tough piece, but I’m worried about getting the fit of the finger joints just right. If they are too loose it won’t be strong enough, if they aren’t straight the arm will be crooked — and useless. Or, as we say around here, “kindling”.
I’ve updated my working copy of the plans, you’re welcome to download and follow along. I’m just making plans to sort out the details in my head, based on the materials I have on hand. On the saw arm, I haven’t resolved the gimbal attachment mechanism. In the plans it’s not shown clearly, although my understanding is that it’s a weird wedged mortise and tenon construction. I’m not sold on the idea of cutting mortises into the back of the frame, so I’m still noodling on that detail. And of course the seat assembly and front clamp are still to be done (virtually and actually).
Your CAD renderings are over the top. They look like I could reach over and pick them up.