Wow... that RK05 must have been fun to get up there.
When I rack-mounted my RK05s (I have them in the 5th 'bay' from the
bottom of a pair of H980s), I took them apart first. Took off the covers,
all the boards, the PSU module, front panel, positioner/heads, spindle,
spindle motor, blower, etc.
The empty chassis wasn't too hard to handle and get onto the rails, and
then I just had to put every back in place (which wasn't hard, and
amazingly the heads didn't need aligning).
-tony