I've got some 5/8" ex-MOD pins that are really neat. These will act as the hinge pin. They can be removed easily to take-off the back.
There will be a steel frame on which the rear deck sits. This will have adjustable gate hinges at the fulcrum -
http://www.ebay.co.uk/itm/1910749494...84.m1439.l2649
More to come in the next week or so........