'The opening of the seventh seal in Revelation 8 - begins the unfolding of Revelation, which is in the remaining chapters of Revelation.'
What do you mean by this? That the Trumpets and Bowls are the events of Revelation? Yes, this understanding is correct. My issue is that you won't just understand it sequentially as it is written.
Your chart is just the standard pre-trib model from Fructenbaum - there's nothing particularly right or wrong about it since you won't say where in Revelation things go. The covenant starts at the 2 witnesses 1260 days, this I agree with. But the 2 witnesses 1260 days are up at the end of the 2nd woe!
Meaning the 1st woe (the 5th Trumpet) must come before the 2 witnesses.
But from your perspective, this would require 2 abomination of desolations - which you won't accept.
But there are 2 abominations: the abomination statue before the 'sign of the son of man in heaven' from Matt 24 & the abomination 'living image' of Rev 13 which comes after the 'sign' which occurs at Revelation 12:1.
The 1st abomination occurs in the 'middle of the 7'. Hebrew months were initially just numbers, so Tishri 15 (Sukkot/ Feast of Tabernacles) is this event, the 'middle of the 7th month' which kicks off the start of the Trumpets/ 1st woe. The 2nd abomination is the standard 'living image' event, but this is at the 7th Trumpet/ 3rd woe.
4Jesus answered, “See to it that no one deceives you.
5For many will come in My name, claiming, ‘I am the Christ,’ and will deceive many.
6You will hear of wars and rumors of wars, but see to it that you are not alarmed. These things must happen, but the end is still to come.
7Nation will rise against nation, and kingdom against kingdom. There will be famines and earthquakes in various places.
8All these are the beginning of birth pains.
The 3 woes of Revelation are the 'birth pains'. 1st then 2nd then 3rd birth pain (5th, then 6th, then 7th Trumpet) (which you want to say as 3rd woe then 1st then 2nd).
The 'beginning of birth pains' can mean 2 things: events before the start, OR the events during the start (as in, the 1st woe, 1st birth pain).
And that is how Revelation is laid out: these wars, martyrdom, famines, false christs, etc before the events of the Trumpets & Bowls. That is why we are seeing famine ramping up as we speak. We will see these things before the 'end' starts.
Then when the 'end' does start (at the 6th Seal/ start of the Trumpets), these are the events during the 1st woe. Then the great tribulation starts at the 6th Trumpet/ 2nd woe. Here is the great tribulation:
continuing Matt 24
9Then they will deliver you over to be persecuted and killed, and you will be hated by all nations because of My name.
10At that time many will fall away and will betray and hate one another,
11and many false prophets will arise and mislead many.
12Because of the multiplication of wickedness, the love of most will grow cold.
13But the one who perseveres to the end will be saved.
[2 Witnesses right here!!]
14And this gospel of the kingdom will be preached in all the world as a testimony to all nations, and then the end will come.
Then the 3rd woe/ 7th Trumpet.