Aaron, you're in kind of a tough spot here. My advice would have been to go with a Trumpeter or Hasegawa G-10, but you stated that you're too far in. The cowl bumps are too large, you'd have a lot of work to get them down to the appropriately small size. Keep in mind that you'll also need a new oil cooler since the Erla design was wider and more shallow than a Regensburg machine. You've done some nice work with the exhausts, if there's any way to extract them and go with another kit I'd definitely go that direction.