You're making the ultimate "parenting mobile." Keep the rear cab seperate so that they can't bug you. You thinking about putting seating back their or making it storage. Also, it looks like if you go bigger than 35" that you may have some tire rub on the rear cab. Interested to see how it comes out.
I have a couple of sets of jumper seats from my cruisers so Im making the rear passengers face each other.. I will have front seats that will slide ahead and then tilt ahead to allow people to access the back... i am also playing around with the idea of making the "3rd door option" as well on the drivers side....I am also grafting in vent windows for a ford ranger because they are the closeset windows in size to the toyota window....
as for the tires, i am going with 37s.... this seems to be the happy medium right now..I will be 4 linking the rear and the rear axle is going back another few inches. I am probably going with coils out of either a tj or something similar.....the plan is for a v6 out of a 93 4runner with tranny going to marlin dual ultimate(there are a million rolled 4runners with relitively low miles in the wrecking yards here for super cheap so this is the most cost effective option...probably will upgrade in a couple years when the 3.4s get cheaper eventually..).....the duel will happen at a much later date though.... so far I am only 350$ canadian right now into this build so I am doing good....