Front speakers

Wow, amazing work and I’m impressed at how quick your turnaround is! Can’t wait to get home and see what modifications I (you :)) would need to make for the planar speaker option.
I think the primary change will be to go to the two piece approach, and to add the oval filler on the back
 
OK, JC. Here is your new part. I'll be expecting a discount on my next brain surgery! :p

This is the two-part unit that I mentioned above. It also has the oval filler bit.

The idea is that the speakers mount to the baffle from the back, using small sheet metal screws. The baffle with speakers mounts to the dash using flat head machine screws that engage small blind nuts (T-Nuts) in the back of the dash.

The plate replaces the plywood plate behind the wood grille (with a piece of suitable thin cloth sandwiched between the plate and the grille). That assembly then attaches to the baffle using the blank holes. I did not do anything to try to get the posts to flex because the entire plate is pretty fragile. I added some strengthening ribs that fit into slots on the front of the baffle to add a bit of strength. I figure you can use some of that earthquake putty to secure the grille.

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