Here is my final layout for the dash.  I wanted to put the Boost Command next to the Scanmaster but they simply do not fit. I don't like the fighter jet look, but the gauges and controls are necessary, so I guess I gotta deal. I used double sided tape to hold the SM above the CD player and an adaptor for the CD player with EQ provisions.  A Dremel Moto Tool allowed me to trim the fascia quite nicely.  The ProPain controls are held by Velcro and do not fall, since the vacuum hose and wires actually hold the control up a bit.  The Boost Command (under the speedo pod) is held with a modified radio back strap that's been attached with a #6-1 1/2" screw.  Some fresh floor mats and a new steering wheel will freshen up the interior quite nicely I think.
Mark's Big Mouth Lite kit looks great polished alongside my MPE aluminum up pipe, also polished.  This is my second kit from Mark and I'm very pleased with fit and finish. The LS1 MAF works very well, as well.  The ProPain jet is closer to the TB than suggested but it's too late to fix that now.  Future plans call for a Jethot coated turbo shield and installation of my sheetmetal upper plenum and modified TB.
Quite naturally this is the trunk setup.  I didn't like the original location of the gauges so I used extensions and a 90 degree to place the regulator on the side, as you can see.  My future plans call for boxes on either side of the tank holding 1 10" woofer each with a cosmetic connecting plate giving it the appearance of one big box and therefore hiding the propane setup.  I hated drilling the hole for the NOS line but I used the drain plug in the spare tire well for the purge hose.  Once I get new carpet in there and tidy up the NOS line it should look a tad better than this.  Might paint the tank black too.
If you missed my MPE downpipe pictures, you can take a look here.  You can also see how the engine compartment looked before all of the polishing.