JoTIKa own the manufacturing rights to the Aerokits range. The Sea Queen is currently available and the smaller Sea Commander is scheduled for future production but I agree that the Crash Tender would probably be more popular. As the Sea Commander is practically just a scaled down Sea Queen it's probably easier to manufacture using CAD techniques. The Crash Tender is a completely different design.
What you have to remember is that many people these days are not used to building their own hulls. they expect GRP or ABS ones to be provided, and this may limit potential demand.
Colin