I think I must be loosing the plot - how did I miss the photos of the locks. They do look very neat and made for purpose rather than a cobled together job. The pegged forend threw me a little as I have a couple of ML with barrels pegged to the wood - but of course no hinge - I am beggining to think it is an age realted issue!!!. I would imagin these conversions were always a toss up between the effort of modifying a piece or making a new bit from scratch with labour much cheaper in relation to the cost of materials than it is now.
Time for bed me thinks!
John