There are 2 major problem in order to solve my problem ,in making a fuselage .
1)While applying loft step by step (so that the curvature is maintained ),the guide curves disappears after the first loft command, from the model(What a magic)
2)Even if i tried doing directly the command say invalid thin feature
Below are the model ,please help me as a beginner.

Files uploaded below

https://grabcad.com/questions/why-i-cant-apply-loft-command-properly-in-solidworks