The piece of dowel will have the boiler and blades added to it. You cna see holes drilled in it so the boiler can be pinned securely in place.
A simple chair made from thin mdf was added next, again pinned but with 2 longer pins which will slot into the figure and hold him in place.
Below you can see the rocket pods, made from a bottle cut in half and covered in strips of masking tape to give a wood effect, the ends are plugged with dowel to allow a propellor to be fitted.
They are slottted onto the mdf cross oiece and secured with 2 brass rods, these were an after thought and both gave strength and improved the look, but involved a complete dismantle to allow the holes to be drilled.
The boiler was made from a few bits of bottle and plastic I had in my scrapbox. They are all pinned to the central dowel . I've also added wheels and a support rod.
With te figure added and the tail fins in place I now have a good idea of the final look. It needs lots more brass bits and tubes etc though.