I took a square boat floation cushion and tied it down to my chair and it raised the height by 2.5 inches made a bid difference on the back and knees.
Really. I wonder where you got that idea?

I did most of my first year long lining with this one. Your right it makes a big difference. I then moved up to the 6 inch foam bungied under my bravo cover.
Then I put it incorporated it into the seat and by far the best ride yet. Been there done that. No added suspension with the boat cushion. More foam. I'm telling you. You won't regret it. Lots of foam. recovering the seat is a piece of cake. Even if you don't sew it.
Here is a little something I do when I am making a set. A warm drink or some cup of soup is a nice break

Wings I need wings. Thats next.
Really though I bust as much brush as any bravo rider out there. I don't think you would hang up on brush. If it isn't going down in front of you are off to the side of the machine your in trouble with your windshield anyway. I think it would be quite functional. Just have to figure a quick disconnect to open the hood without a lot of hassle. Will find out hopefully.
My hope is to be able to carry my sleeping bag, pad, tarp and some gear on front for a night of camping.