Nino, I don't know who has the rights to demo man ramps but if you ever get a chance to stock some it might pay you to grab them (basically all of them are hard to get except the under p/p popper) - I think you'd move them on pretty quick. It may be the case nobody is making repros yet but most of the NOS are gone & there's very few dm's around without at least one cracked or chipped ramp.
It all depends on the tooling. If the original tooling is still in existence, then Starship Fantasies should have the moulds. I can ask James if the moulds exist. If the tooling is not available, then if there is demand, then they can be made. There's a lot of organizing to do when reproducing a ramp. Quality is the biggest concern, and PinballInc & Starship Fantasies will only release a quality product.