In the 1970's Martin Evans produced 5"g designs based on the high pressure loco "Fury" and the Royal Scot class.I think the latter went under the title of "Royal Engineer" The tender was described in M.E. Vol 142,No 3532 in 1976: Details of the standard L.M.S. 4000 gallon tender for "Royal Engineer", also suitable for the "Rebuilt Royal Scot", the 5XP and 5P5F classes and the 2-8-0s.
Built a Tubal Cain 'Trevithick' engine (as the 'Catch Me Who Can' loco).
Building GWR 5101 class tank loco,and a 5" gauge BR Standard Class 2 tender loco.
Planning a 'Large' Metro.