RE: YAK 18 from SIG?
Here's a photo I found of a pretty nice looking Yak. The Yak was designed by Claude McCullough for SIG. He is a world champs quality modeler. I would need a memory check on this, but I think Claude competed at the Worlds with the Yak once. It's certainly a builder's kit, requiring a good bit of time and energy to complete. Don't expect the kit to hold your hand through the process. It would be a very special piece of work when finished.