That will be a lot of weight on your top. I was in the same boat with an RB and a manual pop top. Do you know how much your aluminess clone rack weighs?
You can definitely muscle way more than 200lbs up, but you need to support the corners of the top with dowels once it is up, and also when you drop the top its more of a hold on for dear life than "lowering the top" situation.
I am a surfer as well and found that the best setup for me with the manual top was no large rack on top. Instead, just 2 or 3 yakima/thule cross bars. Then a Thule/Yakima box attached to the cross bars on one side of the bars and the other side of the bars strap your surfboards down (ie...the surfboards and the box are side by side).
Inside our roof box we had surf wetsuits, freedive wetsuits, spear guns, etc...all in waterproof duffle bags. When we would stop to camp we would just need to open up the storage box and throw down 4 waterproof bags to lessen the weight. If you have a swing out tire carrier/aluminum box like we do you can just set your waterproof duffles right on top of those.
We went through a ton of iterations on surf craft (ie...6 boards, 4 boards, etc...) when finally I found the magic sauce is (2) EPS/epoxy boards. Light and durable. Something like a Stretch IT and a CJ Nelson Music is a nice combo. Something for good waves and something for small waves. If you go that route and then use a super lightweight travel bag you should have no problem leaving your boards on the roof when you pop the top.
If you do go with your Aluminess clone rack, I would get rid of the thule box you have and just use waterproof duffles to keep your wetsuits in. Will make it super easy to take them off the roof before popping top. You can get cheap ones on ebay.
I think most people on here will agree that the full-size aluminess roof rack on a manual penthouse top is no bueno. Great for fixed top van or for CCV electric top, but not ideal with a SMB manual top. You can pretty easily bend/bow the scissor arms with too much weight going up and down.
More than that, it just becomes a major pain in the ass. I was hoisting way too much weight up and down for far too long. Save your back and your frustration and keep it light up there!