After much trial and error (I used up a good portion of my Fotoplast supply) I finally have a set of shells that I am happy with. They are certainly not pro level, but they seal well, and look good for what I was hoping to accomplish.
Now to get the driver config finalized, the recessed connectors installed, and get through the somewhat long process (I am way too picky about sound for my own good) of finalizing the tuning.