It would be a fairly large fish, so you'd need a big tank. Remember that all carp are very social fish, so you would want to keep it with other goldfish or koi.
I wouldn't try it unless you have a specific goal for the fish in mind, and you plan on keeping the fish for up to 20 years. Koi can easily live for 50+ years, and goldfish have a 20-40 year lifespan. If you just think it "might be fun," don't try it. The breeding would be difficult - you'd probably have to hand-spawn. You would have to raise more than just one fry, so plan on food for a bunch of hungry carp, plus selecting the best one and culling. Then you'll end up with a fish that you'll get tired of in a year or so. The concept has already been proven, and you might end up with a deformed fish. Not a good idea.
I wouldn't try it unless you have a specific goal for the fish in mind, and you plan on keeping the fish for up to 20 years. Koi can easily live for 50+ years, and goldfish have a 20-40 year lifespan. If you just think it "might be fun," don't try it. The breeding would be difficult - you'd probably have to hand-spawn. You would have to raise more than just one fry, so plan on food for a bunch of hungry carp, plus selecting the best one and culling. Then you'll end up with a fish that you'll get tired of in a year or so. The concept has already been proven, and you might end up with a deformed fish. Not a good idea.