Alfasean you start a debate... I have one in my '61. I like it. Others don't. But fair to say that with my 1500 cc engine, something more was needed. The mods on the grey Maidstone are all sensible (even if they cause debate...)
I helped Martin do the six speed conversion on the grey one and I've got to say the Moto Plus is totally solid and original underneath, the best I've seen. All original spot welds can be seen and no rust when I saw it a couple of years ago. A bit tired inside but it's over 50 years old and bares it's age very well.