Hi Speedy,
Seems to me to be a big motor to run to only produce 12 volt power. Is there much these days that you can use with 12 volt power ? Many years ago there was a range of things that could be run on 12 volts, from memory washing machines,fridges radios etc but not sure what is around these days. Also looking at it I think the engine pulley should be bigger to have the alternator spinning as fast as it can to produce max power without the motor running flat out. What have they used as a regulator, I assume this would need to feed into a battery to have a stable power output?