Gray-B-Gon wind-powered evapotron for graywater disposal

Step 10 Make a deep end and assemble the tray

Materials:

• four builder's shims, about 16" long.
• about thirty medium screws.
• #6 countersink bit, or 6/64" and 9/64" bits and a countersink.

Assemble the tray upside down on the 2x4 frame.

Put a dab of glue on four builder's shims and lay a pair on each side rail, with thick ends butted together about 16" from one end of the tray.  These shims will create a "deep end" of the pool beneath the drum.

Lay the 1/4" plywood floor on the 2x4 frame. Place plywood feet on each corner, along the top and bottom edges.  Look at the diagrams below for screw placement; make sure you will hit each shim and foot with at least two screws.

Some 2x4 frames just won't have perfect 90-degree corners.  So, line up the frame and floor at just one end, clamp, and either drill 7 counterink holes, or drill 7 pilot holes; enlarge the holes in the feet to 9/64" body holes, and drill countersinks so the screws will lie flush.  Drive screws.  At the opposite end, persuade the frame and floor into alignment; clamp them, and drill and screw them together.  Finally, drill and screw the sides.