Thanks bullet and ctbram

bullet, thanks for the links. I'll have a look at them when I get home. (Work web proxy issues)

ctbram, I do have a confession to make. I haven't rigged the landing gear yet. Below is my challenge - 5 pivot points!

Joint a rotates in the xy plane.
Joint b rotates in the yz plane.
Joint c rotates in the yx plane.
Joint d rotates in the yx plane.
Joint e rotates in the yx plane but it also rotates around the local y axis (+- 8 degrees) to compensate for the fact the joints a and c are not on the same plane.

The rigging will have to wait until next year. I have just a week left before my holiday and I am focusing on getting the modelling done.