I have some old 4" pvc and a lot of 1.5" pipe. Was thinking about building 10' x 4' frame with 4", using some of the 1.5 pipe (with ends plugged) across bottom to provide flotation / support throughout the middle, then using the .5" plastic netting with burlap / old blanket / towel / curtain or something over it to help retain soil; but not prevent roots from going through, then spagnum moss, potting soil, etc. seeded with grass seed or something. Was going to paint the PVC either brown or green once together and before put dirt on. Considering hanging other pvc pieces off 4" frame to serve as structure for fish about perimeter. What do you think?