Pond Boss Forums POND CONSTRUCTION Creating habitat RES nesting box

Looking for suggestions on how to build a nesting tray/shelf/box for RES. Has anyone done this?

My pond has a 3 to 1 slope and it's full! Could I build a tray, fill it with sand or gravel or clay (?) and prop up one end to compensate for the slope? I have a backhoe and could use that to place it where needed or I can put it on my boat trailer and guide it in.

How deep and big should I make the tray/box?
Bigger is probably better but would a 3'x3' or 4'x4' tray work? I would be happy if even 1 RES would smawn.
Is wood ok to use? I also have a welder.
What to fill it with? clay?
How deep should I place the box?
Is there a better way to do this without drawing the pond down?

TIA