bill,
youre late! already thread here ;-p
http://www.jnsforum.com/index.php/topic,5800.0.htmltheres always the little greenmax mow kit. its little engine is quite like this. just need the crane! been looking for a little crane like this. there is a guy in canada who does cast vehicles and has a crane quite like this on one of his models. been looking at getting one to get a crane to make more castings from. not that horrible to scratch build one out of some styrene. could get fancy and articulate it!
i looked at powering the greenmax with the little tgw and prohobby mechanisms and most were just a tad too big to easily do it. finally decided to make a generator car thats built around a kato 2 axle motor unit i scored cheap. many little mow trains have a generator car.
jeff