..and camper interior...
Nope... 
a) You wont use the stove. Imagine getting bacon grease all over all the cloth in there. You'll always cook outside. 
b) the cabinets make the bed 18" narrower. ALL Vanagons come with a full-width z-bed.
Why take up all that room with stuff you wont use? Stock Vanagon is ready to camp and carries 7 passengers!
Pop-top is the option to consider. Makes it so you can stand up and adds 

 space for 2 and cools the Vanagon in the warmer months. (Pop-top is a scientifically designed chimney)
Before I get blasted... In answer to "Well why are you doing a FULL Westy conversion to the Syncro?"...
The Syncro is an investment and putting in all the useless Westy stuff increases the value of that investment exponentially