just finished my first repaint of the -800. Well, nearly finished... the problem is, that i cant find the positions in the bmp

Yes, Frank. unfortunately that's the only way to figuring it out, Trial and Error.You could also stick in some reference lines, preferably different colours on the fuselage and tail and then match them up and save it for later use .. ;)But it's kind of fun with trial and error, if it were aligned already it would take away the sweet mystery in painting ... LOL