Thank you most sincerely again Colin.
this is exactly what I need. I am sure my end result will be nowhere near the perfection achieved by Peter, but one does the best one can.
I was happy, and surprised that the V4 ran on air at my first attempt albeit somewhat roughly. It went smoother after some adjustments.
I did not fit the water pump, and slightly changed the steam chests but by and large stuck to the original design.
Thanks again Colin,
Regards
Eric