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THIS generation that will not pass till all be fulfilled began June 5, 1967. If the Rapture is Nisan 10 of this year (the same date when the Milennium was supposed to start with Jesus' entrance into the Temple on Palm Sunday of 36 A.D.), then the entire 2520 scenario ends March 5, 2013, which is exactly 45.8 years from June 5, 1967.
A. I've made similar calculations in the past. The problem is that a generation is not the length of a person's life but rather the span of time between a man's birth and the birth of his first son. When Jesus said that this generation would not pass away in Matt. 24:31, He meant that the generation of people being born when the End times signs began would still be alive when He returned.
A Biblical life span is 70 years, according to Psalm 90:10. Using that figure and beginning with May of 1948 I came up with 2018 as the earliest likely year for the 2nd Coming. Beginning in 1967 takes us to 2037 as the latest possibility, so there appears to be a 19 year window of opportunity for all to be fulfilled.
As for the Rapture I believe it has to precede the 2nd coming by at least 7 years. If the Rapture fulfills a Jewish Feast date I prefer the 6th of Sivan (Pentecost) since that date and feast are linked with the Church in many ways.
I will do further research on your other dates. No matter how we figure it, it won't be long now.