Altogether I got five more or less silly solutions (not my judgment!), some of them further discussed in private mail, for a problem where my expectation was to get a simple one-liner back: "Check ?clt" or so...
Fortunately, with all of them I seem to arrive at a result that is consistent with what my expressions evaluates to (104.25) which gives me a great opportunity to play around with the various approaches - "brain fodder" for quite a few days.
Great experience,
Thanks to all,
Rainer