You might wana add some more supports on that high rail... and what did you use for the top? looks like it will slide really good.
heres a new rail made for free
the "U" shape one.
it used to be an indoor arch thing but the person i was workin for was remodeling there house and threw it away so i took it. also this other guy i worked for gave us a ton of those grey pvcs.
so we now have
12ft box
8ft "U" Rail
16ft fat double barrel rail (Which is broken at the moment as you can see but were gonna fix it)
No im in florida right now on vacation... Then going straight to tahoe for a few weeks then back home december 16... Ill have snow by then so ill make an edit
i have literally the exact same rails
2 8 ft long double barrel with the exact same supports.
definitely put metal angle braces on the supports. my rails were startin to wobble all over the place after they got rained on once and the screws loosened up.
Here's the video. Sorry it took a while. Me hitting the rail on the first shot, and later in the video. We didn't have enough snow this winter to hit it straight on so we had to set it up urban style