R.W. Kastner is probably better known as 'Kas' Kastner who built this car nicknamed ""Kassaratti" based on an MG TD around 1959/60. He had already built another cycle-winged MG special in the early 1950s so I presume this was his second car.
Kas Kastner ran the Triumph Competition Department from 1960-1972 before joining Nissan's competition department to bring success to their racing programme. His position was Vice-President of Nissan Performance Technology.
There is of course, a lot more interesting history on 'Kas' Kastner that can be found on the 'net.