Just ran across this forum and had to join!! Its blowing my mind!! This is my exact build I'm about to start...other than the DBR kit, which I'm building myself. I have a 99 4 door 4x4 as well. have 10" king coilovers for the front. Have the 64 (leafs only) springs, and king bypass for the rear. I'm just waiting to find the right full size rear end. Like you, I had a ranger that I'm using some parts off of, had kids so the extra seating is a must. My issue is I already have the rims/tires but they're 15's, so using a full size with disc brakes is out due to 15's not fitting on larger rotors. What rear end are you running? I apologize if I'm rambling on but I'm very excited about finding this!!
That's cool. What are you planning to do about the front axles (assuming that you are intending to keep the 4X4)? There is a thread on DR where people are trying to create another source for the 930 CV adapters. You may want to start following that thread as well. If you are ditching the 4X4 then you have a world of opportunities.
Using 10" shocks is possible but may require a bit more work. An 8" shock will allow for 14" of travel and avoids issues with needing to relocate the brake booster. I am using ADS shocks that are roughly 1.5" longer (extended) than the King pre-run shocks that I had on my Ranger. Just that additional 1.5" of length has caused me to shuffle things around a bit under the hood.
I also have kids, so building another Ranger was not an option. That being said, I will be running with 2 seats until I can source the funds to replace the rear bench that no longer fits.
I am running a 2003 F150 9.75 axle. It has 13" disks which require the 17" wheels. 16" might fit, but it would be tight. An F150 8.8 may be a bit more flexible, especially if you picked one up with drum brakes. The 9" is the sexy pick, but I opted to run the 9.75 because it used the same tone ring pickup and the tone ring has the same number of teeth at the Ranger 8.8 (trying to keep the computer somewhat happy).
Feel free to shoot me any questions that you may have and I will answer them to the best of my ability.
Welcome to the board.