That's not very impressive (
), my friend has a Spey on the back of his:
And yes it is going to be run on there. He also has a Olympus 593 that fits on the back of that lorry, that will be an exciting day when we get either going.
Nice job on the Derwent-mobile though, it looks great. If I didn't have so many turbines taking up the space I'd have it!