Awesome...I can't wait to see this. Please take many photos to share with the forum. Think about adding some milk crates, PVC pieces, or a cedar tree or two around your spawning beds to allow the BG fry a safety zone. I bet you could place cinder blocks on the front and back side and straddle them across a cedar tree. The weight of the pallet and substrate might hold the cedar in place without much need for permanent anchoring as they will get waterlogged and sink before too long.

Many men go fishing all of their lives without knowing that it is not fish they are after. ~ Henry David Thoreau

[Linked Image from i1261.photobucket.com]