Someone else mentioned this issue to me earlier and I just wanted to chime in that I had a decent experience with Yurkie starting back in in Feb of this year. First I shipped my Colecovision controllers for modding, and then a few months later the system for A/v modding.
While he was not especially fast and I had to touch base with him a couple of times, I think the controllers were done in about 3 weeks and the system in about the same time. I was pleased with the final product. I hope he can get back on the ball with his other customers because when he comes through he has a good service.