1/2 inch decent sized breaker bar or shifter will get the drain plug at the bottom out pretty easily. There is the fill hole on the side. You can buy pump bottles from supercheap etc. to pump the new fluid into the box via the plug on the side. Fill it until it reaches the level of the fill plug. Job done.
Coz i have the max ellery manual, here is some info from it.
This is for the MF5 (i would guess it would be similar if not the same for the turbo box, in the past i have on a 180sx filled from the shifter coz the fill nut was wrecked, but that required snap ring/circlip plyers to get it out, ive heard also, with those fill plugs in the side, once oil starts coming out the hole while its on a flat surface, you have filled enough... dont quote me on that tho).
Drain Plug torque specs : 25-34Nm
Oil Capacity of transmission : 1.9Lt
Specified Transmission Oil : Dextron 11D
Filler Plug Torque Specs : 25-34Nm
At the back of the chapter it states
Lubricant : 80W gear oil to GMH Specifications HN1855
Capacity : 1.9Lt