Here's my build thread. May or may not work depending on how many people and what you're priorities are. Sacrifices some Interior space to allow for large under bed "garage" for bikes and other gear. Having both front seats swivel helps with additional living space.
The design works very well for me but not for everyone.
Have only traveled with one other, sleeping on the main bed. Could easily fit small children sideways above the cab. Also could put a pad on the aisle and fit a bigger child or smaller adult there.