I've been using Inkscape quite a bit to modifiy the L-5 kit. Am finding it easier to manipulate new lines and such while in the beta testing for the ambulance version. While doing some related research, I discovered something that may be useful to folks trying to work with drawings of aircraft that have cross-sections, but not enough of them! See the Inkscape tutorial for the Interpolate tool here:
Inkscape Interpolate Tutorial. Also check out the
Blur Tutorial and
Creating Woodgrain Effects.
Ryan