Hello Daryl, fancy seeing you here
Rainbow speakers and Audison amp eh ... sounds like you will have a Boxster that sounds better than mine
To answer your questions:
- Flat door panels = not enough clearance for the back end of your midwoofer
- Can door pods be fabricated = yes they can. You will need to cut the existing door panels to fit the door pods. Ask on MEA for recommendations for somewhere local that can do it for you.
- Is this cheaper than buying a secondhand door pod = depends on your luck.
- Should you use the rear parcel shelf = NO! Maybe use it for a very small subwoofer but do not put your midrange drivers there.