Hello Topi
You Have a Mk 1 I agree with Phil yours is a Formit Hull ,nothing wrong with a Formit hull : I know Egret II is a Baker hull 1972 with a amateur fitout and launched 1973 .She has no stringers glassed in along the hull . What gives her strength is the plywood stringers /bulkheads that run forward to aft and are glassed in, which also form the support for the bunks .So you have your forepeak bulkhead glassed in ,then your main bulkhead glassed in. And in between them you'll have the plywood stringers glassed in between the two bulkheads. Then on the other side of the main bulkhead the plywood stringers continue back and finish just under the start of the cockpit . The bonding of the hull to the deck is done by sticking /gluing the two together and then glassing the hull and deck together with fibreglass . The toerail is only to protect the hull from knocks and to make it look pretty.
Bear