As a side note:
If the Bredford Dolphin is too big and/or ambitious, there's also HMV's research platform FINO 3:
FINO3 Offshore-Forschungsplattform in der Nordsee - Artikeldetailansicht - HMV - Hamburger Modellbaubogen Verlag
Beware: That one is
not an oil rig, but has a lot of it's features plus a very nice Bo-105 Helicopter!
Michi