From what I have been told, and from the limited experience of the one I shot, the powerplant is very similar to the RWS M48/52 with the exception being of course where the cocking arm is located (underlever vs. sidelever). Maybe check with Jim Macarri to see if his Monolith kit will fit it, if not maybe he can set you up with what does fit. The disassembly/lubing should also be very similar to the M48/52 and there are a few how-to guides around the web for those models, just do a search.
hth,