Hiya All
On 3d Warehouse I found the following model:
Within that page is a link to [using Google translate] :
http://translate.google.com/translate?js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&sl=de&tl=en&u=http%3A%2F%2Fwww.kolmanl.info%2Findex.php%3Fshow%3DSKETCHUP_TUT
for a tutorial on how to use Sketchup to model a Model Airplane by Ivo Mikac [I think!].
Enjoy