Our raft was an 8x10', aluminum framed with cedar decking. It was still heavy as hell to move. Be mindful of that when building. We lifted ours out every fall and kept it on the dock or just above in the yard. It was always a miserable task to do this, between the weight and slime factor. Usually a 3-4 person job to do it, we have done it with 2 but it was a tough time. This year I had ISS remove and install it, money well spent.
Spend the money for stainless chain and shackles, and plenty of weight for your block. Not sure where you are on the lake or what type of water you are in (depth, exposure, etc). I would think 500lbs min if you are out in the open. If not, 250lbs may be fine. We went with a concrete disc shaped block from Watermark. I think ours was a 250lb and it worked fine.
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