Once you had made up the inside pockets you can continue to sew the lining together.
Place the two bag linings with the right sides together. Pin and sew down the sides and base as before, but NOT the cut out corners.
Flatten out the corners making sure that the side and base seams are directly on top of each other.
Keep the lining inside out and the bag the right way around. Now put the bag inside the lining. The two right sides of the bag and lining should be together.
Tuck the handles down in between the bag and the lining.
Pin the bag and lining together all the way around the top edge. Mark a gap of 10cm between one handle.
Sew all the way around the top edge of the bag leaving a gap between one handle.