RobR does still make batches of sleds occasionally. There is a link up the top.

Is there any particular reason why you need the schematics for the metalwork? If you're going to be making your own player equivalent then nearly everything would change. The components inside the empeg are pretty old now and are no longer available so you can't use those. The software would need to be recreated from scratch as well. The only thing that would vaguely be similar is the metalwork but you might as well do that from scratch since you're doing everything else.