Thanks to Mark's help and that of Forum members I have at last got the tracks fitted and running I am at the stage when I need to commit (or not!) to buying and fitting the auxiliary motion control for the guns etc. Gill and Mark have as always been very helpful but I would welcome any advice/comments/tips from those who have already fitted the pack. More specifically at what stage were the servos etc installed and how straightforward was it given the limited space etc. I am also installing the main motion and sound packs.