1
Clamp the two front legs together, measure for the 3/4-in. deep notch and make repeated cuts with your circular saw set to 3/4-in. depth of cut. Chisel the pieces between the cuts and then file smooth.
2
Spread a light bead of construction adhesive into each notch and align the front stretcher (B) with the edge of the legs. Drill and screw the stretcher to the legs.
3
Mark the angle on the back side of each arm and cut the arms (C) and arm supports (D) with your circular saw.
4
Align the arm supports with the top and front edges of the legs, then drill and screw each front leg to the arm support with two 1-5/8-in. deck screws.
5
Fasten the horizontal arm supports (E) at 90 degrees to the front legs. Then glue, drill and screw the rear legs to the arm supports, making sure the arm supports are parallel to the floor.
6
Cut the seat supports (G) from 1x6 boards. Align the square front edge of the seat brace with the back of the front stretcher (B) and glue and screw them to the front and back legs.
7
Mark a diagonal line on H3, then clamp the board to your sawhorses and cut along the line to make a pair of outer back slats.
8
Set the back slats on a flat surface with 1/4-in.-wide spacers. Center the back braces on the slats. Glue, drill and screw them with 1-1/4-in. deck screws.
9
Align the bottom of the back assembly with the seat braces and the tops of the rear legs. Screw the legs to the back brace and screw the horizontal arm supports to the center back brace.
10
Space the seat slats (M), evenly starting at the back. Drill one pilot hole on each end of the slats and screw them to the seat brace. Screw the front seat slat to the seat brace as well as the front stretcher (B).
11
Set the arm flush with the edge of the arm support (E), overhanging the front leg 1-1/2 in. Mark the arm where it meets the back slat.
12
Notch the arm with a handsaw and fasten it to the horizontal support, the top edge of the back legs and to the front leg and arm support with 1-5/8-in. screws and glue.