L C Mason wrote a book on the Minnie, W J Hughes wrote on the Allchin, if you can get hold of either they would be a great help, but might be hard to find at a reasonable price. Alternatively, the Minnie was serialised in detail in ME in the early '70's IIRC. The Allchin was serialised twice.
Edited By Clive Brown 1 on 03/09/2017 11:08:06