Hi Douglas - Thanks for the reply, i'll give that Forum a good look over. The search for a suitable box frame starts tomorrow...
I've carefully removed the side plate & taken a couple of quick photos, Its possible that there may have been a sear safety hole but the metal is just too corroded & the edge has been lost on shelf, i presume there wasnt much metal between the hole and the edge in the beginning.
From a closer look the number on the trigger matches the frame
Anyway, hope the pictures are of some help...