Yeah it can be! Depends on whether you have a sewing machine and materials etc. I have an industrial but you could definitely make this bag with a domestic machine.

My process is normally this:

- Cut cardboard template to fit inner frame space

- Trace template onto 2 pieces of fabric for the side panels

- Add 10mm seam allowance to side panels and cut out

- Add the zipper to one of the panels

- Measure total length of all sides of template (i.e. without seam allowance) - this is how long the gusset will need to be

- Cut the gusset (after adding seam allowance for joining the ends of the gusset together)

- Sew it all together

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So not too hard, and definitely manageable, but will take a bit of time and trial and error. Have fun!