While the top is drying, measure the thickest portion. Add 1/16” to this measurement and mark a horizontal line with a framing square across the tops of the table legs. This line marks the gutter structure mounting depth. Legs will protrude 1/16” above the plane of the tabletop. Ask a helper to hold the leg tight to the inside corner of the gutter structure with the mark at the top of the gutter. Drive at least two wood screws through the inside face of the gutter into the sides of the leg.
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Your monster of a table is going to be HEAVY, so I strongly recommend moving it to its final destination in two pieces–lay a blanket down in your dining room, put the top on it upside down, then the frame upside down on top of that. Attach a couple 2×4 supports across the frame for good measure, then begin the frustrating process of centering the frame on the top. Once you have the top centered, attach your brackets–I did two on each end and three on each side.
Set biscuit joiner depth to #20. Lay the four best planks out on a flat surface and arrange them in final position. With a pencil and working across two boards at a time, make a mark at every 8-inch point along the seam of two boards. After marks are made, use the joiner to cut the biscuit slots at each location. Align the reference mark on the tool (similar to circular saw) and hold the top plate firmly flat against the board. In one smooth motion, plunge the tool until it hits the stop. Note: Do not cut joints on outside edges of first and last board.