Thank you everyone - my plan to show an aircraft fresh out of the factory has now gone, but never mind.
Now that the wings and fuselage painting is done, the rest of the masking is removed. I attached the tail surfaces, engine, and the front cowlings as seen here. There is some touch up paint to do, and additional painting such as the pump on the cabane strut, the strut brackets etc, and some work to blend the top cowling in with the rear fuselage.
I also dry fitted the outer struts and all the wings - they go on simply and (to my eye) reasonably accurately. I did the same with the undercarriage struts - again a positive fit which should make the geometry work! The prop is not glued on, just sat here for the pics.

