Why re-invent the wheel (or pedal)?
Yes, it could, and quite well, according to reports. It was no more underpowered than any other piston helicopter of the day. Certainly better than the infamous Skeeter.
There are indeed. First the old BK-117 style tail rotor, then about 3 or so years ago they updated the design with the H-135 style Fenestron.
As for paint, what about a WIP model still in the factory before painting, looking something like this?