Corner lights are cheap (and they're not glass). Just go down to Nissan and order some.

Engine swap isn't horrible, just requires a few pairs of hands and knowledge on what to unplug and drain. Undo wiring, drain coolant, remove intake and header, remove fans/radiator/hoses/disconnect heater hoses. Loosen engine mounts and transmission mount, disconnect driveshaft (possibly drain tranny oil). There's lots of misc brackets to get rid of too before you yank it.

Good time to do a 5 speed swap. You'll need the driveshaft, proper flywheel/clutch, pedal, line, shifter/tranny (obviously).

During rebuild, be sure to check on the timing chains and tensioners, the front/rear main seals, any gaskets you encounter, and also the mess of hoses under the intake manifold (prepare to be wowed by how many there are). You can block off the EGR and basically remove almost all of the emissions stuff except for the IACV. Make a list and head down to Nissan (or check courtesyparts.com or whatever it is now), and get the OE stuff - it's worth it and it's not that expensive.