Posted pix of one I did last year here:
http://www.pcenginefx.com/forums/index.php?topic=9394.0It is possibly Charlie. The mechanism that you sometimes get with the KSS-220A lasers has a sled motor / mechanism and everything. It could be wired in pretty easily, the trouble lies in fitment etc. One could make a crude setup that might actually work using one of those mechanisms.
PM me charlie and tell me what kind of pictures you want and I'll scan you some good ones.