Not that hard to scratch guys, really. I have done a driver and commander's interior, inserted through the rear hatch like a ship in a bottle, 'cause I had glued the top on before I decided to detail it. (Doh). Once you got the floor, step up and wall in place the rest is easy. You don't see a great deal through the hatches, particularly with a crew in it.
The rear is mainly the bench seats, etc. Lets face it, unless you pop the top hatches (do they ever do that?) the inside will be dark toward the front and the detail will not need to be exact. If you open only the 'priest gate' on the rear hatch, almost nothing will be seen. The real challenge is the lack of exterior detail. The inside of the forward hatches, mesh intake screens, step up rial, incorrect wheels, Exhaust stack, etc.
AFV Interiors had great sketches and pics. I have a copy of all that if anyone wants it (email me).