Good idea to remake the dock too if they just need powerwashing, drying out and resealing!
If you are interested, I found the old thread with good pictures of pallet stacks and floating minnow structure.
Minnow structure ideasA few posts down in the link above user 'larrybud' attached pictures that you have to click on. He had his suspend with rope all the way across the pond (or a corner of your 1 acre pond maybe) for better suspension. Regardless boards will waterlog and I'm not sure poly rope by itself will float them. You could add PVC that is capped for buoyancy or add foamboard, or old motor oil plastic jugs or 2L pop bottles with lids on the underside here and there.
