Great Job, they look fantastic.
My first DIY was very close, I used the SEAS aluminum 10" (can't remember which model #)
My second is using the Accuton 5.5" C158 instead of the C173, and a powered 15" woofer.
Isn't this a fun hobby.
My wife and I have been listening for a few hours.
NO combination of caps on the midrange didn't destroy the 'openness' of the C158. We have Cast Pio's, VSF, Mundorf Silver/oil, etc.
Do yourself a favor, run the midrange with no high pass cap. Listen, then add the cap. Let me know if you agree, or if my wife and I have just had too much red wine?.