The System
Being a teenager, having a soundsystem is almost essential. I saved up and put down 2 grand on my new system, most of which is Alpine and MB Quart. I bought the components off the net, which saved me over $500 from what the shops charged. Me and my dad built all the subboxes and platforms out of plywood and MDF, because the only other two options were buying square normal boxes and having no room in my trunk, or having pros do it and spending another $500 bucks. I had a local shop, Cartronics, install the components as well as carpet the trunk, and I think they did a damn good job.
CDA-9805 Alpine Deck
F-450 Alpine 5-Channel Amp
SWS12D (2)Alpine 12" Type-S Subs
DKC-169 (2)MBQuart 6x9s
D (2)MBQuart 5 1/4s
Absolute 1.2Farad Cap
Before
Here's what the Stang looked like several days prior to the install.
Here's the empty hole in the dash.
The old kickpanels. Wires for power antenna on the floor.
Brand new package tray, ready for some 6x9s.
The trunk, primed and plain.
The Install
The installation was a long process due to the fact we were starting from scratch and all the custom work that was required.

These are the subboxes I made out of 3/4" MDF. I measured the various dimensions of the forward trunk, and figured out a plan that would satisfy the size of box the subs needed. I used liquid nails and screws to fit the box together, and sealed the inside with silocone. I had to drill holes in the box where the screws would go to prevent cracking of the MDF, which I learned the hard way.

Here's a bunch of the pieces of the platform sitting on the ground. Once we figured out what we actually wanted to do, the physical cutting and building of the platfrom was easy.

Part of the platfrom inside in the trunk. The angled wooden piece towards the passenger cabin was screwed into the trunk inself, and the subboxes were then screwed onto the wood. The platfrom is held down by screws through the chassis in several locations, to make it removable, yet stable.

Although I was skeptical at first, I put down the extra $130 for the dynomat trunk kit. It covered a good portion of my trunk, but not nearly all of it, as advertised. However, now that the subs are installed I am very pleased with it; there are no rattles (even in this 40 year old car), and the sound from the subs can barely be heard outside the car, even when it feels like an earthquake on the inside.

This is everything in the trunk, ready to be carpeted and look nice.
Ahh success: The Finished Product
After all the work and money, it finally paid off. The guys that installed the system did a great job, and people are still amazed when they see the trunk.

This is my interior as of now, the custom kickpanels fit the 5 1/4"s pefectly, and the deck doesn't look at all out of place in the dash.

Close up of the dash. Out of all the options (under seat, under dash, in trunk, in glove box), I chose just go simple and cut the dash. I'm not planning on keeping the car original at all, so one more mod won't hurt. Nice and easy to access it that way too.

Here's the rear package tray with the 6x9s. The sub boxes lie directly beneath where the speakers would go, so they had to be raised up a couple inches.


And of course, here's the trunk. The 2 12s fit nicely in the center. The amp and cap are on the right hand side, kinda cut off. The well is still big enough to put anything I'd need to put back there, although I doubt I will to keep it looking nice.
And take my word for it, It bumps.
Thanks for looking, If you would like any info on the install, PM me and I'll do my best to help you out.