Dave,
Yes, If anyone thats interested in a set of panels wants to send me their upper metal door core, I will bond the new fiberglass door panel to the existing door trim and send a completed unit back to them at no charge for that service.
The provisions for the speaker are actually 6.5, however, with different speaker manufactures your going to run into slight variances in size... so I recommend taking the panels with you when you make your speaker purchase and don't forget to allow a little give/space for your choice of upholstery.
As far as arm rest go... yes you can use pretty much any armrest you want to, remember the new arm rest sits up an away from the base of the door itself which allows you to use the power window set up as well as space to rear mount (from behind) any door handle you want. The handle should be or would be mounted prior to the installation of the panel on the door.... I'll mock one up and take pics for visual purposes.
In addition to Daves questions: Lots of people are asking if the arm rest comes covered ...NO!! it does not, you have to cover it yourself. I covered the one thats in all the pics in a matter of 15 minutes with a hot glue gun and a piece of scrap I had laying around.
There are supports that I wasnt going to install for people but due to the number of call I've gotten I've realized that there are a ton of people out there that no nothing about fiberglass so I will be installing the supports/mount for my custom arm rest.
I also will not be supplying the door pull cup (the piece that I borrowed from my Mitsubishi) as shown in the pics.
If anyone has any question please post them or give me a call and I'll be happy to assist you in anyway that I can
Pete
510-938-8297