My niece’s husband (former army Blackhawk pilot, former firefighter, now flies for the local ambulance company) built a 1944 Willis jeep from spare parts. For a while, he was an instructor for the army in Alexandria LA, and would fly around the southeast securing the parts, while his trainees fulfilled their flying hours.
The jeep looks like it just rolled off an assembly line, and if you examine it, you can tell that it was designed so that it could be serviced/repaired in the field by soldiers with minimal automotive training. If you raise the hood, a small skinny human can literally stand on the ground on either side of the engine block. It really is that simple in design. For me, the most intriguing aspect is the sliding knob on the frame of the windscreen to manually operate the wipers. My niece did make him install seatbelts, which detracts from the authenticity. She refused to ride in it without them. Tops out at about 40 MPH. Apparently it was designed to haul, not haul ass.