Thanks Everybody!

L/W,  I agree. I would rather have all drawers myself,  
but I won't argue with a client if they're going to pay me money.  lol

They do make little corner bumpers you can put on the edge of the drawer that will hit the door before the guide will.
And I'm not positive, but In my mind I believe I've seen guides with little rollers on the end that hit the door first,  but I'm old and can't remember for sure.  If they don't we should invent a little snap on roller that does.  $$$

I will always recommend drawers first though.

Figuring out how to do something you have never done is what makes a good challenge.