Thanks, Glad you like it!
Well, first I set the VW Van body next to the Ferrari Body. Then I drew a line, following the Ferrari's side shapes onto the sides of the Van. Then I cut off the Van body just below the line to give me a little extra plastic to play with...
Next I set the Van body on top of the Ferrari Body in the postition that I liked and marked the top of the Ferrrari body along the bottom of the Van Body Edge. Then I cut out that section of Ferrari Body.
From there its a matter of cutting and fitting the two bodies a little at a time untill you have a good fit. Then Glue the bodies together and apply a good putty, like Automotive Spot Putty.