Congrats on the house, has it got much room for working on the LJ? Also found these and thought they'd give you an idea for the sj tube doors
https://www.4xinnovations.com/Tube-Door-Slam-Latch-Kit-Included-with-all-door-sets_p_96.html
Let me know when you want a trip out Ben, maybe we can go The Lakes.... we're having our first venture in Cumbria in 2014 on 7/8June. As ever i have created two monster days for us to go at.