I use a well known (at least in Europe) PE-detail manufacturer to do the actual etching work, i don't etch them my self. Their work is so cheap, that it doesn't make sense to learn that my self. If you need me to draw the actual sheets, then i can help. But price depends on the parts that are needed, and is impossible to say anything before you tell me what you need. If you only need the etching, then i can give you some contact information.
Your photoetch work is really impressive. If I supplied you with the artwork ready to shoot, would you produce custom photoetch for me? If so, how much would you charge?