A little off topic as far as the audio goes; those vans have well known transmission problems. the first thing you need to do with the van is get the transmission serviced. Try to find a shop with a transmission flush machine and have it flushed. And make sure that a good brand of ***** fluid is used when it's changed. No matter what the manual calls for, have it serviced every 15 to 20k.
The van got regular and thorough maintenance.
***** got fluid changed about a month before we bought it -- probably dealership.
It is as mechanically sound as a used 127k vehicle can be.
The last suggested maintenance item was PS flush -- I'll do that myself probably at 1st oil change.
Prob needs some front end stuff - there are some creaks and noises that I would like to improve.
From what I've read sway bar bushings on these wear easy and are noisier than most cars.
In my experience - it is a safe bet that an automatic transmission WILL fail at some point. USUALLY
We who choose to drive po' folks cars are willing to take that risk and eat the ~$2k rebuild if it comes to that.
But back to the audio -- I'm seriously considering a fiberglass sub enclosure. I did one in a trunk years ago. Wasn't much fun, but I did like the results. I think this one would be quite a bit smaller and less time consuming.
Not sure about how/where I want to mount my amps. If the sub enclosure goes well I may consider something with fiberglass for those as well.