Reshelling looks a bit involved
Reshelling was a bit involved. It involved getting a brand new airframe from EC(D) and installing all the components from your donor aircraft. However before all the components were installed, they were overhauled. At the end of the process you have a brand new, zero timed B0 105DBS-4. Only a couple of airframes were physically stretched, by the insertion of a plug. One such is G-NAAB S/No. 412 but that aircraft was not zero timed.
All this work was carried out by Rotortech ( a Bond subsidiary) at Cambridge.
Glad to be of assistance.