While I love both and understand the pros and cons of both I am going to be honest in that I think the 2 Door looks more fun! Keep the weight down and watch the 27L rip. If you can live with 4 passengers and less 16" of storage then the 2 door is where it is at!
I think it is 16". Also there is sheet metal up to the rear of your heels and in the 4 door the seats are sitting on posts. This is a gain in space beyond just legg room. The floor appears to be virtually flat upon seat remove!
I agree black brings it down several notches for me. Unless shiny black in person changes this I am dead set on the lighter colors? Cactus with white is the front runner here......
In my 19MY SuperCab F150 with the 27L / 10 Spd combo I get 21.5MPG mix. My weight is 4,436lbs so compare to the estimated Bronco weights? I expect the weights to be similar if not lighter than the F150?
The fact that they went as far as adding many thousands of sq ft at Wayne to accommodate upgrades at the plant I would assume the approach at day one was to allow for most mod friendly vehicle ever made. You have nothing to worry about. They emphasized this plant space early on and are proud...