In one of my plans I want to create a shower cabinet of non-standard shape. (As seen below) 
 
  
  
Now, I want to start the door on the right parts of the slab in order to have a wide enough passage way. To make it all appealing however, I want to make a door that actually looks like a door and is preferably hing-able. 
  
 
  
So; does anyone here know how to make a custom (hingable) door, that is straight for about half of its length and arched for the other half?