Well, I've got the kit, as yet un-started. Does that count?

The Sig is a bit smaller than the GP offering. It was designed around a 60 two stroke, and the cowl is a bit cramped for anything larger (such as a 91 four stroke). I want to put a four-banger in mine, and just may fabricate a Super SkyBolt cowl for it. The Sig is modeled after a regular SkyBolt, not the Super- which must have a larger engine.