Guys, it has been said a lot, but I'm still and meaningfull repeating:
thank you so much for replying - and above all so quick!
Hard to believe that someone across the world has the same thoughts and fears as I do - it really, really helps a whole lot!!

I will measuring my fuselage with a plumb bob - I didn't do it at first because i thought it has been SkyStar manufactured and therefore faultless..

And I will not worry (about this one) anymore - thanks to you all.
I now will take the task of covering my plane, getting an engine onto it, and rig once more to get it right - or to leave it if I can't.