I had the same issue, wind gusts from the side were so loud, it was ruining the driving experience.
I had the trim custom made by a company we use at work. Since it was a custom run I actually had to have an entire roll made.

(yeah, the noise pissed me off that much)
I have a bunch left if you need some. I would have to look at the invoice, but I think it was under $2 a foot.
The cargo net is actually half of an elastic cargo net that McmasterCarr sells. The eyelets are actually drilled-tapped-lock nutted into place. The structural metal ribs are surprisingly thick, just enough metal to thread. I have since added more eyebolts and just used nutserts (did not have the tool when I first installed the net) but the original eyebolts are still holding after many thousands of miles.
The expanded metal is not actually expanded metal, it is a square pattern of rods, welded together and dipped in plastic. Just about perfect for the use, I think it was originally industrial shelving base, I found it in a dumpster. They do block some of the light, but I travel a lot of gravel roads and having headlights not get broken is worth the compromise to me. I used to just have a piece of expanded metal zip-tied behind the grill to help protect the radiator from flying rocks, that worked well, but this is lighter and covers the lights as well.
The clevis is just personal preference. I find that the clevis makes you slow down and do things right, make sure things fit, is inherently stronger and safer than a hook and it stands no chance of disconnecting when the line is slack. I just don't like hooks.
The lower brackets for the seat have simply been removed, when the seat is up it is wedged in place between the seat base and the cargo boxes. Originally I planned to run a turnbuckle or strap to the floor for the seat down position, but since the top pins are set back from the top it locks itself in that position by way of the two extra latches and leverage. Even if I pull up on the front of the seat (when folded flat) It will not go anywhere since the back (top) levers down against the wheel wells.
