Step 1. Build back legs
Cut the back legs symmetrically and straight to each other where the front sides need to be cut in sized ¼” for curved edges using 2×4 boards. Make sure you complete the inside cuts on the back. After the legs ready, lay them on the floor and check if all sides (front, bottom, top) match altogether.
Step 2. Build the side aprons
Add the side aprons to the back legs in parallel with the front cuts bottom. Check if the legs are in parallel to each other or else your chair will be twisted.
Step 3. Build the front legs
Assemble the front legs into the side aprons. Make sure all tops are even. In this step, the chair should be perfectly installed with no lose parts.
Step 4. Attach front and back aprons
Insert the front and back aprons by drilling and securing the joints with screws and glue. Make sure the top frame is all even.
Step 5. Add four cross supports
Attach the cross support on each edge of the chair frame. These cross supports will provide more strength for the chair. Moreover, you can use the cross to screw the chair seat.
Step 6. Attach the top of the seat back
Add the top of the seat back as shown in the picture.
Step 7. Install the seat back
Attach two seat backs between the chair legs. Screw the seat backs or you can make some pocket holes to secure them in place.
Step 8. Install the base support
The base support is attached perpendicularly with the seat backs. Secure the base support with screws. This additional support can give more strength to your chair.
Step 9. Attach the base center
After the frame is ready, add the base center from the sides of the chair.
Step 10. Attach the seat
Attach the cushion by gluing it onto the seat top. For the cushion, you can choose the cushion foam that is comfortable enough for you. Cover the cushion with some fabric. You can staple the fabric to the chair underside and tuck all corners tidily. Don’t forget to screw the seat into its cross supports. Besides screwing, you can also make some pocket holes.
Step 11. Finishing touch
You can sand the chair to make it smooth. After applying the sand, you can paint and coat the chair. The coat can protect the chair from any moisture damage.