I dont know how different the 200 is to the TD5, ( not alot I think ), but its not that bad a job to drop the transfer box.
On mine, TD5, I took off the cross bar, front and rear props, ( at TB and tied out the way ), off with the brake drum and brake backplate, ( leave the shoes in and tie up out the way), dissconnect gear linkages and speedo, take out all but one mounting bolts, ( leave one finger tight, 3 bolts and a nut on the back, ( nut on the top of the box ) and 2 on the front.
After taking out the last mounting bolt, get under the box and slide it back off the main gearbox shaft, take the strain as it drops onto your chest and breaks all your ribs !!.
On my TD5 I also unbolted the exhaust when I put it back in.
Mind the main seal when you put it back in, and, on mine, the front 2 bolts, that bolt the TB to the main box, have to be sealed as they go through the TB casing.
I balanced mine on a trolley jack when I put it back in.
Del.