This is the same Pathfinder set up as my Transvan, let me know if you have any questions. I would order the front axle bushing kit from Pathfinder before the stop making them. The front axle is a Dana 44 and the brakes are Dodge 3/4 ton 4x4 pickup brakes. Mine also had alot of rust on the roof so I just replaced the roof with one from the junk yard, although mine was a cab chassis so the roof is only 3 feet long. If you are going to take the windshield out try to save the rubber, I have not been able to find new rubber for it. As stated in a previous post do not drive it with the front drive shaft disconnected as it will wreck the transfer case, also the part time kit available will ruin it as it does not allow the oil to circulate.
If you want head room I bet you could piece two fiberglass tops together pretty easily if you could find two matching ones. Mines also has only 5' of headroom and it gets old ducking all the time. Good luck with your project, I saw this when it was first posted for sale and was tempted to buy it. I think I would break it in half on some of the camp spots I go to though.