Hmmm, my Plazmaman has like 7 fittings underneath.
Adapter plate is a little odd. The R33 IAC should bolt up to the rear of the Plazmaman? Unless the customer who ordered asked for something unusual like i did with mine... However, early models could have been done like this. I dont know.
If the MAP sensor is a 1/8" NPT thread you should be able to thread it into the Plazmaman directly.
With the PCV and RB26 covers, you'll have to custom make something. The PCV on an RB26 is on the balance tube of the inlet plenum. You'll probably want to have the LH rocker cover going into the turbo intake and the RH going into the Plazmaman via the PCV one way valve.
The little hose that goes from the carbon canister to the factory throttle body is a good question. I would also like the answer to this as i'll need to know eventually as well. I would dare say, it will need to go to the intercooler pipe just before the throttle body.
The larger pipe from the carbon caniser is plumbed directly to the plenum as well.
If you only have 3 fittings, before fitting the plenum maybe its a good idea to drill and tap some more holes in it.
You need provisions for:
Brake Booster
Fuel Press Reg
Carbon Canister
PCV
MAP Sensor
Boost Guage