@India42
The Capstan was so heavy that we had to build a new winch to launch it. Side by side tuition seems like a good idea till you have to convert pupils to single seaters. We bought a Swallow which seemed a good idea but the differences were quite a problem when briefing new solo pilots to fly it. At Dunstable (a later club in my career) we trained in K13 and soloed on the K18 (a K8 with K6E wings). No problems about conversion. What the pupil saw in front of him was exactly what he saw in the K13.
Even aerotowing the Capstan (we had a Tiger) was quite challenging from our small field at Stoke on Trent, and we used to joke that a bus timetable was useful to be sure of a safe exit over the hedge.
However it was great for checking out potential instructors and the National Coach had one, and I took my ticket in it at Sutton Bank.