Thanks for the hours you put in to get it into readable form
For the FET, the answer to your question is in the FMH07N90E datasheet.
This shows type C with also the usual intrinsic diode from Source to Drain (though that diode is not used in this application).
One more mistake that I made in my sketch is that ZD2 on base of Q5 does not go to the ground as drawn, but to the negative input supply - the nearest point is pin 5 of U1 that has this connection.
I see that you have used just a single symbol for ground, while there are two different ground references and they are not connected: everything that is connected to the right side (secondary) of the transformer has the negative 48V output as reference, typically this is represented with a single fat horizontal bar but you might keep the symbol that you already use.
Everything on the primary side (left of the transformer, connected to the AC input) has the "frame ground" as reference since the AC input voltage can be floating. This frame ground (which is the actual alu case of the NES) is typically indicated with 3 flat bars underneath each other, each lower one is shorter so they fill in a triangle shape. You only need to correct this in 3 places: C3, C4 and the 4n7 cap under the two 680uF200V caps. And you can add a third input contact next to the 110/240V AC input, for connection of Earth ground. This contact you can also tie to frame ground.
The fuse is a fast-acting 8 Amp 250V AC standard size 20mm cartridge. The only thing different than usual is that it has a ceramic tube instead of the usual glass tube, probably to avoid it exploding and sending glass shards when something goes short circuit on the input, for example when a massive voltage spike (lightning strike?) hits it and protection ZNR1 tries to contain it or when C1 decides to short circuit. It is interesting that the PCB says:
F6.3AH/250V for NES-200
F8AH/250V for NES-350
while elsewhere on the PCB it is indicated that this board is NES-350-R1 2010/11/30 so not only is this a pretty recent design, but also it has leftover markings from the NES-200 design, which means that other NES (different power level) might have a lot of similarities to this design.
OK, we are on the home stretch here - these are the only cleanups that I could find. I will re-post my suggestions for current mods and the fan mod to get the 12V fan to run continuously, so we have all NES info concentrated in this thread.