I had posted this elsewhere before I found this thread
I have found how to greatly improve the fit of the nose and canopy and it is as follows
1 .glue bulkhead h31 directly to the front of the main fuselage
2 glue front fuselage halves together but do not glue the floor section(which is either c13,17,18,23 depending on which you want) tape it in place only.
3 test fit nose to main fuselage, it will almost certainly sit a touch low ( check gap between floor section and the bulkhead) trim the tabs on inside of nose or notches in bulkhead to allow nose to sit higher so there is no longer a gap between bullhead and floor piece.
4 once you have that gap gone tape side of nose to main fuselage (1 piece of tape each side so it cannot move up or down) then remove the floor section you taped earlier, sometimes there is a step between the nose and main fuselage where nose is a little narrower if you are happy with the fit then glue with some liquid cement from the inside if you are not happy shim the nose to bulkhead till it is flush then glue.
Following this process gave me much better fitting of the upper fuselage to nose section and of the canopy so that the large gap shown at the front of it and around the refueling probe in Mike's pictures above just about disappear
Hope this helps
Mrmavx