Turning Several Shapes into One

So what I have here is a shape I created using circles, squares, boolian, etc. As you can see the arcs overlap and so when it cuts it cuts to the end, stops, then starts back as a separate shape. How do I merge the outer shape to be one shape and cut as one? I’ve tried grouping, closing paths, auto join selected paths, etc but I can’t seem to get them into a singular shape. I’m sure I’m just missing something simple but can’t seem to figure out what.

I pushed the shapes apart so you can see what each one looks like, but they align to create a singular shape.

The simplest answer would be to close the upper and lower shapes, overlap them, then use Weld to combine them:

I managed to get the top half to auto join but for some reason the bottom half won’t join fully. It just separated itself into 2 parts and won’t join those 2 parts. Everything looks aligned, and I’m not sure where I’m going wrong with this.

Honda Adapter.lbrn (17.9 KB)

The bottom was a group. I un-grouped it, then joined it, and did the weld.

Honda Adapter Fix.lbrn (16.4 KB)