Looking good.  For the chassis paint issue, I suggest masking off the engine and exhaust and shoot it with some Dull Coat. 
  
This kit's a little fiddly, but if one takes time picking out the details, it does build into a decent looking model. 
  
I'm working on converting one back into a hearse.  It's a long, slow process and I got stalled by a couple of issues I don't yet have the skill to address.  But seeing yours makes me want to start on mine again. 
  
  
David G.