Now draw the profile using parallel projection on the reference image. You might want to copy the reference image off to the side for this as the seat and back could be in your way trying to draw. This may take some trial and error and a bit of guess work at the bottom.
Edit the seat back component then use the push/pull tool to give it the thickness of the chair back. Use the reference image in the upper right.
Move the profile for the chair back down in line with the seat back components. Select all of the geometry in the profile and cut the selection. Ctrl-X on the PC. Then edit the seat back component and paste the geometry into it. Ctrl-V. Push/Pull the profile through the seat back then intersect it with the front face. To intersect it only with one face select the profile you push/pulled and select the face you want to intersect. Then context click and choose Intersect Faces / With Selection. Otherwise if you do With Model you will intersect everything that face touches and in this case will create extra geometry you don’t want.
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