Gday mate. I just did this swap into my EG8, so I can help with some of the stuff, but I think there are some other issues that I did not have, re fuel supply, such as fuel pump.

Anyway, 1) you will need the shift linkage from the EK4 (or possibly other b series linkage?). Unless you feel like custom making one. If you're handy with a welder, thats definitely an option.
2) For the front brakes, you will need the steering knuckle/hub assembly, rotors and calipers. Your stock brake lines will work. For the rears, you will need the rear trailing arm, with handbrake cable, brake rotor, caliper, and brake line. I'm pretty sure I wrote all of this up in one of my threads, but havent got time to find it now.
3) yes, you should use a bigger brake m/c. I used an EK4 one, as i used the EK4 brakes. This is a pia to install.

You DONT need engine mounts (if carby engine mounts are the same as d15), but you are welcome to get some if you wish. I got hasport ones coz my old ones were cooked, but they are VERY stiff.

You WILL need a rear bracket from an ITR.

You WILL need a loom from an ITR, because EK4=obd2, EG=obd1. there will also be some wires that will need to be added / connectors changed.

You WILL also need an appropriate ECU, preferably with hondata or some other tunable set up. I think the ecu I used was a p28 or maybe p72 (not 100% sure any more) with hondata s300. However the ecu I used does not have knock sensor, and the b16a2 does, so maybe an obd1 ecu with knock board would be a better idea, but im not so hot on ecus.

I think thats it. Oh, you need the b series drive shafts+half shaft too, but that should be part of the half cut.