Hori Pad EX-2 is a mere $35 and has undoubtedly the best d-pad of any aftermarket controller for the 360. If you're insistant in modifying your own, keep in mind you're looking at $5-$20 for a replacement/aftermarket d-pad anyway.
I would be willing to write an accurate English translation for your description of the buttons if you would be willing to compensate me with shipping costs for the buttons.
A little big of gramatical adjustment will go a long way in getting your point across.