This sounds brilliant. I'm running a 12HT with bare floor boards, and it's a tad noisy inside

. I'm interested to see how your set-up works for you.
Are you planning to write up the sound system upgrade?
Wasn't planning to. It is pretty basic. I have a JVC AVX33 coming (the newer one, the 44, has all touch screen and I think that would be more dangerous to operate). I am getting the Sirius box and the aux in cable. Have yet to hear good things about Ipod connections when you start to have a largish music set, say over 10GB. The JVC I picked over the Alpine media head unit because JVC has built-in bluetooth and a CD/DVD player. Alpine should have the edge in music quality as it uses Burr-Brown DACs.
Running a zapco 500.1 and got a 350.2 for 2 front speakers, which I think I'll go with the nearly highest Focal 6.5" speaker components they sell (higher mid-range stuff). Building an mdf baffle to fit the mids into the stock location and mounting tweeters higher on the door. Sub is a 12" Image Dynamics in an mdf box.. integrated into the rear storage/sleeping platform I have built (mine is currently just a mock up draft). I have a zapco SP4-SL processor for minor eq tweaks and sub gain.
The only trick part is the receiver has a video input and a nice compact video display- something like 900x300 resolution in DIN size, so I am going to run a Helmetcam behind the front axle to do remote spotting.
Read the stuff at the RAAMmat site. He has good information and has been working with the stuff for a few years. I decided on RAAM because he is local to me and got one of the best reviews on that sound deadener shootout web site.
I used the word "serious" above because I am currently running a decent Alpine head and powering 4 coax Infinity Kappas off it, along with the 500.1 zapco powering a 10" Infinity Perfect 10 sub. It is ok sound, but the Infinity stuff doesn't hold up well and got sloppy over time. The new strategy in car audio is 2 front speakers to tighten up your sound stage, but using quality components for it. I have an ear for detail and enjoy more musical than SPL audio. But the good musical stuff works your equipment very hard.
What i would really like to do is figure out a way to mix all my sources. I have a 2m radio, CB, ipod, satellite radio, possibly my nav computer audio, CD/DVD, radio and bluetooth phone all as potential sources, and I'd like to mix those channels to my preference to elminate things like the head unit deciding how to control the switchover when a call comes in. A friend of mine has a pretty trick Vanagan he uses for exploration kayak work. He just uses a 12V mixer going to an amp. Guessing my next rev will be something more along those lines.
I guess I can take pics of the whole package when I get to that phase. It will be a while; a month or two after I get the 1HZ done. Most of my parts collecting is finished.
kramermic- spray-in would work, and I have seen setups where it is a great solution. I just don't like the idea of spraying something over sound deadening materials. There are plenty of other threads that discuss that material, and I would like to keep this one aimed at the vinyl flooring.