Lots of good thoughts, but I thought I'd demonstrated on the old Freeport forums (late lamented) that it is actually not a completely lost cause to try to design RL vehicles (at least military ones) with FF&S unmodified and a correct interpretation of tech levels. Remember several key rules...
...vehicles and aircraft use crewstations NOT workstations (FF&S Mk1 Mod1 page 47)...
...although the turret volume rule is a little barmy, it is not as bad as often made out because a small turret/cupola only needs to allocate 1.75m3 to its crewmember (page 19 left column at point 2) if not remote-controlled and...
...the only crewmember who absolutely must be in a turret and thus occupy shedloads of volume is the vehicle commander (page 19 right column at point 10)...
...the turret efficiency rules (page 17) only really penalise low tech vehicles which should be designed like WW1 tanks anyway without turrets.