Here we are again, with most of the work done including clipping together a 35 link chain, but realising that on trying to build the last important piece, the nose with windscreen, that two parts are missing! So ordered those today from LEGO by email and had that confirmed by return, waiting 10 minutes on the phone for customer services to answer is not a good idea. So hopefully the parts won't take too long. When I built the Land Rover Defender the missing parts on that one came from Sweden.
Yes the chain drives the rear wheel and the engine pistons pop up and down in correct firing order, all front and rear suspension and steering works fine.