I'm not usually working with complex log shapes as in round logs, I'm doing square log which simplifies matters greatly, however the shape of the joint itself is complex.
I have had a problem with the shop drawing utility coming up with strange and convoluted renderings of a corner joint.

The other issue is, I don't want a collision to remove all of the material in one timber. I want half of the material to be removed from one and half from another to yield a locking lap joint. (In real life applications, completely lapping one piece in a square log lap would be faster, but it would also make a weak joint prone to twisting and other failures)
And then there is the fact -and this I think is where the utility is getting confused- is that in this instance I don't have a TF joint intersecting a timber, but have a TF joint interacting with another TF joint.

I usually don't worry about producing shop drawings. If I had others working for me maybe I would.

From the looks of things, I may have to get pro at some point.