Crazy windmill

Hi everyone. I got into a discussion with a friend about windmills and how much can be accomplished with so little. We tried to compose the most insane windmill we could (within reason to some extent, as in it could be a real position in theory, even if clearly composed). I'm feeling a little proud of the result, so please check it out and enjoy...
Note: many thanks to @chaotic_iak who made a great suggestion to improve the pawn placement.

White to move and go on a massacre! Is it possible to do better than this 11 piece killing spree?

If you spot a refutation... please keep it to yourself, I'll be heartbroken  Just kidding, of course I would want to know so I could try to fix it. 

Pawn setup is clearly impossible, but exchange f7 and g7 together with b2 and b4 and things look pretty well.

Ah, you're absolutely right! I've now made this change, and also switched the bonus rook on h2 to a queen, because why not? Picture in the first post updated!