I did some checking on photos of actual tanks and unfortunately the gap between drive sprocket and first road wheel isn't a figment of some draftsman's imagination.

Anyhoo, after some careful thought I figured that if I cut off the front of the lower hull and move it forward 5mm with some necessary reinforcement of the hull, I should be able to get both 5mm forward and 5mm up movement on the drive sprocket. I will just have to raise the forward deck by a few mm to clear the gearbox but that's no sweat because it's a scratch build anyway - I'm not constrained by a pre-built upper deck.

The battery box is going as is the smoker unit and the whole hull badly needs reinforcement as it's all 1.5mm styrene and rather flexible, so a whole heap of work before getting to the upper hull build.
Looks like I'm going to need 6 or 8 plastic track links due to the slight lengthening of the body, and if anyone has any spare please pm me with cost and I will be most appreciative.
onwards and upwards!
Alwyn
