Need help with repainting

Hello all,I've got some more questions for you....I am trying to repaint an aircraft with multiple texture files. I figured out how to drwa what I want in the fuselage.How do I align the tail with the fuselage, i mean, I need to draw a line curving upwards, torwards the tail, and for that I need to have the tail and the fuselage aligned on paintshop... HOW can I do that? Is there any way of doing it? or just trial and error?Also, Do you know how can I paint planes that don't have a blank paintkit? How can I get rid of the textures and get a blank aircraft I can paint?And finally, do you know if there is any paintkit available for Project Airbus A320 and for the IFDG GMAX 757?Thank you so much ....______________________________________________Lu