I have considered a few things. If I were to use those seats when we kill the Astro, they would be temporary. The final plan is to use the late model Silverado leather buckets in the front, with a late model Tahoe/Yukon third row bench for the rear. This would move all my seat belts to the seats, and provide really nice seating. They are just very expensive.
I have also started the buildup of my speaker/tool boxes that will include two 6.5" speakers, with a single 10" sub on each side. My amps and electronics will all be mounted behind the side panel on the driver's side, with air solenoids behind the side panel on the passenger side. My panels are going to be custom made by me using a thick plastic stuff from Home Depot. They will be covered with either carpet, or leather, I haven't decided yet. The lower portion of the tool/speaker boxes will be done in bedliner, since they are steel so that they will be securely fastened in the event of a roll over.
All of the taillight wiring is being moved inside the truck, with a simple double gang box to allow easy trouble shooting of issues. I am most likely going to use basic carpet from the local carpet shop, with a good pad, over the top of a bedliner spray.
I am building a custom center console with an incorporated 12v cooler setup, and most likely push button 4x4 using a twin sticked 205 transfer case. Gauges are all going to be mounted in a custom aluminum dash bezel, that I am currently working on. I am currently looking for a couple of 8 position fuse blocks to do a custom wiring setup. I am also building some fiberglass speaker pods to use on the doors, and mounting tweeters on the a-pillars.
My CB is currently mounted in the ashtray opening, with a modified ashtray door to cover the gap below it, the door has three 12v outlets mounted in it. The center of the band on the passenger side is getting an in-dash LCD flip up screen, while the center console will have a 15" screen that motors up out of the back. I have some LED lighting that is going to be used in the cargo area for lighting.
These are just some of my plans, and some things will change as time goes on, and I start purchasing the stuff I need.