Bud - The earphones are the type that push inside the ear, like ear plugs, very small. They can be found at the $2 shops, the cable is a twin cable which is necessary for the two ear plugs, inside each cable are three strands of the braided wire 0.2mm in diameter, the photos explain it better;
Lindsay - I try to air brush as many parts as possible before assembly, as I use Mr Metal Color metal paints spraying gives a better finish due to it's very fast drying properties. As with all parts I scrape paint off areas where glue is to be applied then I assemble the engine. Any touch-up painting can quite easily be done after assembly. Things like plumbing and electrical wiring are painted after they are fitted as were the spark plugs, the ignition leads are natural wire. I try to leave all the RB Motion brass nuts as natural brass, they stand out better.
Ron - The throttle linkage cables are made from 0.25 brass wire bent to shape then fitted to the linkages, a small brass nut was placed near the lingage then the wire was painted black.
Stefanbuss - The Mr Metal range of metal colours are brilliant, they apply extremely well and dry very fast, they can be left as is or they can be buffed to give a nice sheen to suit your desired look. The paint can be sprayed or brushed but spraying is better.
Thanks very much for all the very kind comments.
Des.