Jeff did a Metal Slug conversion for me as well. Its a super professional job, game works perfectly, and the insert, sticker, and now manual all make it a complete, high-quality homebrew cart.
Jeff's work is excellent, he also modded my Neo cart system for the works: s-video, stereo, arcade debug, and two lazy switches for territory and home/arcade modes.
We are all very lucky to have Jeff working in the Neo community, and I'll add my thanks to yours, William, for his excellent work!!!