Do a Google search for "Barens" or "Barens Seatrader".
Barens is a Hollander who had a shipyard in Durban, South Africa for MANY years. First prize is to find a Seatrader factory built by Barens himself. He sold a lot of plans - those built by owners in South Africa he tried to supervise himself where possible.
The last time I saw him was in about 1995 & he was in his 80's. He was obviously retired but still selling his plans and still VERY interested in every single vessel he had ever built. He only used the very best grades of steel.
See a 44' Barens Seatrader at: http://www.seerose.cruiser.co.za/seerose/yacht.htm
Good luck in your search for a steel boat.