Some major things I would have done differently, maybe:
- Bought thinner and/or more pliable material, since the kind I purchased doesn't stretch all that much.
- Sewed the seams. I used an industrial stapler, like your desk stapler, but for heavier duty applications.
- Had more patience. This is tedious work with measuring and going back over to realign the fabric, and I have little patience for small, redundant work