To cut the slots you need a chainsaw plus, and its a big plus, an expert
to use it.
Lincolnshire fencing has been used for years to contain animals but its
mostly topped with an electric fence nowadays. The rails are cut in a
sort of wedge at each end so the the rails lock each other into the
slots. I reckon ten feet apart is too far, the rails will flap in the
breeze at that distance.
See http://www.klmfencingservices.com/in...806&pid=579084
for an illustration.