Hi Sonpark,
You could still consider a Club 500 from Model Slip Way.
If you don't have to stick to the Club 500 rules.
You can just by a boat shell and topsides from him, and then build to your own specs.
I have one that is cut down by approx 5 cms. plastic being removed from deck and hull sides. I have added spray rials to the chine edges, and squared off the transom. Fitted a racing tube and shaft and a much hotter motor. The motor is mounted on a fast electric style bracket, and the saddle style battery pack runs along the centre line of the hull either side of the prop shaft, and not across it. I used the servo and receiver tray, but mounted it at the back of the hull, with a large access hole in it to get to the rudder fitting.
I did find that with a 17 turn double motor and eight cells, it reached the maximum it can handle, but am still to add a turn fin to the transom, which most boats at this spec. would have, and also intend to fit spray rails (old fashioned term) under the hull.
Good luck with what ever you decide to do.
Bob