A few observations, moo and all ...
1) I believe that this was a calculated and crafted letter; this was not the first draft, in my opinion. If this were "off the cuff," I believe we would see "scratched out" errors or some indication that he started to write something and then changed his mind. In 10 handwritten pages, I would expect to see some error or stray pen mark.
2) It was written to garner sympathy and to cast doubt. Poor Wes. Good family man Wes. How could this have happened to a man who loves his family? Look at the heroin man moving in on his wife.
3) I realize there are grammatical errors, etc... but looking beyond that I am a bit surprised that he expresses himself this well in writing. I taught writing for years. If he wrote this, it is further evidence that he is not stupid. As far as why he would include the threats and running (or suicide) --- is it possible that he is so calculating that he added that in there so it would make him LOOK like he is ignorant to the fact that his mail is read? So that the reader would assume that if he is dumb enough to be honest about running out on the bond, that the rest of what he has written is also real? That kind of calculation seems far-fetched . . . but for the life of me I can't figure out why he would put that in the letter. Or an even longer shot --- could he want to stay incarcerated for some reason? I know that is crazy, too, but why would he put that in such a calculated letter? There is a reason.
4. I am no handwriting expert. But it appears to me that on some of the pages his letters/words slant in opposite directions. He almost always begins a line with letters/words slanting to the left. Then at some point near the center of the line his letters/words start to shift upright and then as the line continues slant slightly to the right. Look at the pages that are labeled 5 and 6. I am not saying that this means ANYTHING or that I am reading anything into it. It just visually struck me.
5. I've looked back at old info, but I cannot seem to find the answer to this question and my memory is shot - please point me in the right direction. Was he picked up by the police at his hotel or somewhere else? Did the police get the search warrant after he was arrested . . . i.e. did they enter the hotel later, after the arrest, or while he was inside the room? I just cannot remember. If he was inside the room, it could explain why ammo might be left out in plain sight. He was there so he didn't need to hide it from the maids or whatever. Someone may have just come and picked up the gun but not the ammo. I am trying to think why it was out in plain sight when other items were stashed in the vent.