Thanks Andrei

You've given me some good ideas on how to deal with fin/fuselage joint & wing/fuselage joints I'm having trouble with where neither Network or blend is giving me the results I would like.

Here is a preliminary model I've created using your lofting technique. I only post to show that your time and effort in sharing the technique is appreciated by others.
I've used it on the fuselage, fin, rudder, tailplane and wings. It is giving far superior results than using the traditional two rail sweeps or network both of which tend to buckle and warp if you ask it to change shape to much.

I'm looking forward to trying out the loft to point command in the latest beta as I am hoping this will give a better result on the tips of wings, tailplanes, propellers etc and ultimately a cleaner mesh without all the bunching of polygons that usually occur on export. This should be a better option than creating a very small profile at the tips.