Tracer - I like that design. I think I'm going to try something like that on the next one. I like how it has that thicker braided noseband. And bsms already said it, but..... that works as a sidepull, and the poll is up between the ears. So you can visualise how if you pulled on one of those rings it would create a gap on that side and put pressure on the opposite side, without putting pressure on the poll.
Also because the throat knot is an actual knot, "and not a fiador", which won't come undone, the halter can only come up the horses face so far. If that knot was a fiador then you would pull the halter apart and it would end up over the horses eyes. LOL
And no I don't feel that a bosal nor a regular rope halter works in the same way. With those two pieces you would be attaching your reins down under the chin and when you go to pull on one rein it kinda puts pressure all around the horses nose. Whereas with the side pull you are creating a space of no pressure on one side and at the same time applying pressure on the opposite. It seemed that with the regular rope halter in my case that when I picked up one one rein the horse had to kinda move his nose around to figure out which side I was picking up on. But with the sidepull he knows instantly which side I'm picking up on.
Tying a rope halter is actually pretty simple and rope is fairly cheap, I say give it a try. For the cost of buying a rope halter I bought enough rope to make 3-4 of my own. Plus I was able to customise them to find the fit and function I like most. But after everything I've tried I feel that I'm going to tie one that's basically what you have pictured. I like the sidepull the most so far, and as of this far I have found it has not been necessary to have the noseband further down the horses nose like one would see on a bitted and bitless bridle.
And the one tip I have if you're going to tie your own.....follow the directions on that site I linked to and cut the rope to the length you need for your horse. I didn't do that twice and it took much longer to tie, plus it twisted the rope and now there's twists in the halter. And take notes so it will be easier for you to tie the next one if you have any changes in mind.
Truth passes through three stages. First it is ridiculed. Second it is violently opposed. Third it is accepted as self evident.