These were all built in 1939 and are used regularly in some high performance mountain environment. It's most impressive that they survived for so long and that speaks both for the Swiss and their art of maintaining and flying them. However these are machines that get used and grow old after some time. To put a very technocrat view on it you could find more modern planes with some character for daily flight duties. There must be a reason why the Swiss Air Force had semi retired them before. Even with all repairs and new parts old planes never become young again.
My point is if you want workhorses think about something newer. This goes for all oldtimer aircraft that are used beyond the odd display flight here and there like all with paying passengers.