Hi! I just registered in order to say: That is absolutely awesome. I knew that the engines on that model were the wrong size, but seeing it with proper-sized engines makes a huge difference.
I already have a very nice Psiaki X-Wing, but if I ever get the shelf-space and the money to buy one of these beasts, at least I'll know how to fix the engines!
I wonder if this piece
would work better for the tops of the engines, intead of the cheese slopes and tiles?
I also wonder if it would be possible to change the position of the back half of the engines - the long, thin "exhausts"? They should start in the centre, at the top of the engines - as on the 9493 X-wing. Yours look to me as if they are positioned too low and off-centre.
These are just details, however: the basic concept is sound, and it looks great. Well done!