My first ERAGT2038 was left hand drive. The one in the works now, ERAGT2077 is right hand drive. Why? Because I can. Having driven both, there is really not much difference in terms of the physical layout (shifter on right in both cars etc.) and due to the fact that the driver's seat is accorded slightly more room, you sit essentially almost in the middle of the car anyway.
...and but for a couple of MKIIIs all of the original cars were right hand drive.
There may indeed be a smaller market for right hand drive cars in the US, but there is still a market.
Jim
PS: here are some pictures of ERAGT2038
http://www.erareplicas.com/cars/holden/index.htm