You are welcome. I actually tried your model 2 last night. With imprinting part 6,19,21 it seems ok. The match between them and part 22, 24 looked ok (I roughly checked only). But when I activated all parts meshing got other problem due to part 8 etc., which I think is due to aspect ratio in brick element is too high (too thin). So by setting model mesh size finer, ~30% mesh actuallly finished. I then blankly went to analysis without check details through those constraints and boundary condition because I don't know what you want to get from this model. The model defineitely need fine turning up to obtain converged if mesh is correct. Attached is a very initial steps results that might help your figuring out meshing is ok or not.
It is up to you to keep working on this model or not. Here is my idea that probably is similar to yours: changing geometry of part6 as (part6 - part19); and add cut off portion as a new part; then meshing part19 and copying its mesh to new part and part21, which gives you three identical meshes. You probably still need to turn down aspect ratio that will make nice finer mesh in bricks regions. Good luck.
I think it would be easiest for me to modify the CAD geometry and make a new model. If I encounter any more problems I will let you know.