Cheers Aiteal, well I really don't consider myself much of a modeller and have done very little to the stock model. I mainly just added some bits and pieces from plastic kits I had lying around (in a very haphazard manner)- imperial guard search lights for headlights, a tyranid head for the figure head on the bonnet, a jet turbine from some gw kit on the rear, some tubing from I think imperial guard heavy weapons, replaced the wheels with "anti grav propulsion" which are also made from imperial guard search lights. Then just painted it copying the style of the limos from the famous 40k Compilation cult.