So, you're saying the antichrist (first beast) will not be in the same time period (3 1/2 years) as the two witnesses? If that's not what you're saying, when will the first beast be revealed? I see the timeline you have for "42 months rule of the beast."
I am in the process of making a new thread for my charts - which when it is released, you can follow through those as a study on the end time events. I am waiting for the new thread to be approved.
Meanwhile, to keep things simple, may we call him "the person" ?
For most of the first half of the 7 years, the person will be in the role of being the Antichrist. Being the Antichrist is him being the King of Israel, as the Jews will mistakenly think he is their long awaited messiah. The Jews (Judaism) are looking for their messiah, someone other than Jesus.
While the Jews will be thinking he is their long awaited messiah - the two witnesses will be preaching to them - No, he is not ! Jesus is the messiah.
That goes on for around three years, when out of nowhere their though-to-be messiah stops the daily sacrifice and goes into the temple (to be built), sits in the holy of hollies chamber, claiming to have achieved God-hood. We don't have enough information to determine on exact day the person commits that act.
The person's act will mortify the Jews and they will renounce him as their messiah and King of Israel - ending the person's role as the Antichrist.
His new role will be the revealed man of sin.
God will have the person killed for his act (Ezekiel 28:1-10), assassinated. And after a short stint in hell, the person's soul will be cast out of hell, back into his lifeless body, as the world looks on dumbfounded that he has come back alive.
At that time of coming back to life, he becomes the beast role - i.e. the mortally wounded, but healed head in Revelation 13. The false prophet will have a statue image made of him and placed on the temple mount. On day 1185 of the timeline.
So we know because the image is made of the beast and setup on day 1185 - that he becomes the beast before then, but we can't determine the exact day on the timeline.
When the statue image is set up on the temple mount, the Jews begin to flee to the mountains, while the two witnesses battle the beast providing cover for them -for the last 75 days of their 1260 days time.
On day 1260, the beast kills the two witnesses, and begins his 42 months reign.