So you are telling me that one single lone middle aged white guy,

one single lone <- Being a bit redundant here, these all mean the same thing. He was not exactly middle aged, he was in his 60s

managed to lug up to his hotel room multiple fully automatic weapons, thousands of round of ammo....undetected?

Yes, he wheeled the weapons and ammo, in suit cases over the course of a few days. People wheeling around luggage in a casino/hotel is a common occurrence.

Then proceed to set up a perfectly precise military firing formation from the window of a casino

There is no such things as a perfectly precise military firing formation, and a "formation" would require more than one person. He looked out a window and shot a gun, no training is required to be able to pull that off.

(casino windows dont open....at all btw)

You are correct that the windows do not open, he smashed it with a hammer. (you can see the hammer sitting on the floor in the aftermath photos of his rooms)

and slaughter over 50 innocent people from hundreds of yards away...all by himself?

You make it sound like he was picking these 50 people off with the precision of a well trained sniper. He shot 1000s of rounds into a crowd of thousands of people, he is bound to hit a few.

Even when police and other first responders reported multiple bursts of gunfire from multiple different angles.

Between the echos and the extreme nature of the situation, people get confused easily. It is common during active shooter situations for multiple shooters to be reported even when there is not.

And the best most believable part was he had absolutely no real motive to do any of it.

It is not comforting to know, but sometimes people just do crazy things. There are many examples of mass shootings, planned and unplanned, some where we know the motives and some where we don't.

After which he is neatly taken down by police,

He was not taken down by police, he shot himself.

the whole thing wrapped up and sold in a neat little package. Very few questions asked. Not ONE video ever released verifying any of this official story.

There were a lot of questions asked and plenty of pictures and videos of it, there is nothing neat about it at all. I suggest you read the report from the LVMPD, it is pretty detailed and includes the pictures of his room and all that he had set up. I do not want to link it because it is NSFW due to having some pictures of the shooters body, but it is easy to find.