Over the last couple of weeks I have been constructing what I call "Super-logs"
I took 4" Cor-pipe (4" thin wall corruagated drain pipe) along with 1/2" Sch. 40 PVC pipe and made logs to sink as structure.
I tied three 8' lengths of the pipe together in a pyramid configuration and then
stuck the 1/2" PVC pipe through the 4" to make branches all along the length.
I stuck several pieces of thick styrofoam in the 4" pipes to make it want to float. Then anchored it all to cinder blocks to hold it to the bottom. The result was a log that keeps a constant 4 feet elevation off the bottom in a horizontal position. I hope to be able to fish it without getting hung up.

I then took the same configuration and put it in a vertical position, which allows for a log that rises from the bottom toward the surface. This will give the fish more structure to hold to in any condition.

4" Cor-pipe = $2.98 for 8' length
1/2" PVC pipe = $1.02 each
Stainless Steel wire = Free
Cinder blocks = $1.98 each
Crappie fishing = Priceless