Thanks very much guys for all your wonderful comments, they are much appreciated.
Guy - The engine dimensions are probably correct to scale, it is just a tight fit in the frame, main issue is getting the magnetos to slide under the magazine boxes. I added ignition leads to my magnetos so they may have contributed to the tightness of fit.
Lance - For the hose clamps I simply cut a length of Tamiya tape to 0.3mm wide, then I "paint" the thin piece of tape with an Artline 900XF Silver Metallic Ink marking pen, once dry I then cut the tapes into short lengths then wrap it around each hose, small adjustments to the position of the tape can be made using a tooth pick, a small drop of CA holds it in place perfectly.
Steve - Yep, I've made one or two models in the past

Mark - Once all the internals were fitted and the engine added I did a trial fit of the two fuselage sides thinking that they be a bit tight as well, to my surprise they were a perfect fit if no interference at all with the fuselage frame, engineering at its finest.
Des.