I am not a handy person, I try, but I hurt myself all the time. Two weeks ago I drilled my finger to the run..lol
So I'm taking the coop that's in the picture and fully enclosing it--floor, second window, added ventilation and all. Like you said the guts are there. So instead of having the smaller area to roost at night, they will have the whole coop, which dimension wise can indeed hold 8(I got 7)you just got to redesign it.
I'm actually only doing this because winter is coming and I want a place they all can hang out and they can move around. It would be no different then any coop that is 4x7 when I'm done. Next year I'm making one that attaches to the run and this one will become home to my one rooster and up to 4 rooster friends(in case I do decide to hatch some babies and they are boys--they will become a rooster flock)