Hi, here is a x-tie model.

The x-tie is mentionned in the book Embush at Corellia, first book of
the Corellian Trilogy. It's a X-wing modified with tie-fighter solar
panels instead of the normals x-wing foils.
This model is far to be perfect, i made it rapidly at school (only
place i can acceed 3dstudio) from the x-wing and tie-fighter meshes 
made by Little Bill.
-- 

   Gael Roux  IRESTE (Nantes france).
     Groux@ireste.fr