OK on getting the old truck back, good feeling sometimes unless the other guys beat the $hit ouut of it !
From what I know about the modes and it is from mostly reading about them.
Full Length Console - it is just from an Explorer and done many times. There is a full length console from a Tremor but it is actually two halves, the back is a std shorty console and the front is special design to house an amp and it is usually in black (nice). If you can find a tremor type is will be worth some extra bucks. I run the shorty console but the one from the Explorer Sport that has a removal carrier in the center instead of the standard compartment, I also got an extra carrier for my camera equipment, just switch the carrier for what ever I intend to do.
The Bed - any bed from 93 to present will work. IN ’98 there was a cab change but not in the bed. My ’03 EDGE is running a Steppie from the mid ninety’s. We all know the downfalls in changing the bed, the bolts and the filler neck and RUST. For the bolts spray a rust buster on the bolt from underneath at least two or three times before starting. There is a good chance that your filler neck will have a crack in it, check it out while the bed is off, far easier to replace then. Also RUST on the frame, where does your frame stand ! Clean up and rust proofing will make it look good but how much rust-through the frame is there, is there any thin spots, they all need to be addressed when the bed is off and you have the time to get it done.
SAS - I too am thinking on the SAS but we need to think about what we will be doing with our truck and what others do with their OEM Diff setups. Other than the hubs the OEM Diff has faired well in DD and light off roading, which is where I will be. SAS will look good but if done too high creates more situations that will need to be dealt with, i.e. spring, axle choices, steering box - toyota seems to be the most used, and then you get the track bar and the correct angle of mounting and the steering rods and pitman arm. There are a lot of the SAS's out there so info is available but just putting some thoughts out.
Good Luck on your choices.