I did one and it is easy, just be sure to get all the correct parts to make it easy, like the led tv bracket. I might be able to check it over if you get it close to complete.

After rereading your post I gather you maybe mean 220 to 110v? I at first thought nucore.

Also I have one here, I converted to new core. If you want you can come and see mine and see how it is wired. Also I have a complete extra populated playfield if you need parts.