Looking very nice!
Couple of questions for you -
Is there a reason you couldnt bring the cut a bit further forward and shrink that back window more? to get a bit more tray
Also, how come you cut along the base of the belt line bevel instead of at the top, just under the windows? Looks like you've got the skills to cut out and weld the little problem areas, with a bit of rubber extrusion running around the tray...
Here's a photoshop hack-an-slash of what i mean - although yours will look pretty similar i guess.