8 seats in 4 blocks of 2. This makes the 3d printing cheaper and simply means 4 resin casts rather than 1.
Seats are shown folded up, but I may do a variant with a seat down so you can mix and match. Shown here is underseat cabin/storage, fixing ring for cargo/vehicle load, seat hinge with the seat pad folded up and above that a head rest (very sketchy) and then at the top an over head locker.
I have been considering webbing belts in a 5 point harness but am beginning to think that a hard harness (like that on a theme park ride) might be a better idea.