My reading indicates, the SX250 was to be one of 6. It was created under contract to Boris Forter, who was to find 4 or 5 friends to buy SX250s as well. Those friends backed out, or never showed up. Only 2 SX250s were built, which may include the prototype.
Another hitch in the SX250-Reliant story is, David Ogle was was killed in an auto accident before the SX250 was finished. The Ogle Design company approached Reliant about building SX1000s. Reliant was already developing the Sabre, and reached an agreement to use the SX250 design with very slight modifications.