"WOOD" magazine published a plan back in the 80's that fits both of these characteristics. It is relatively simple to construct and looks great. It will handle a 12" width but this can be easily increased. For purchases you will need a motor, two pillow block bearings, a shaft, and a switch. Yes, thats it, except for the wood and fasteners of course, The listed sources may still be available.
Say "Thank you WOOD magazine" and enjoy.