Looks like you intend a four-piece pattern:
- one piece for bottom and two sides
- two square(ish) pieces for the other two sides
- one U-shaped piece (probably) for the dividers and a partially doubled bottom (this could also be two separate pieces but would need to be stitched to the bottom or parts could slide under these walls and between compartments).
You’ve extended the sides of the longer piece and wrap it onto the two smaller side pieces. You could eliminate the overlap of those pieces back onto the longer piece. This would cut in half the number of stitches and rivets you’d need for the outside. Given the abuse I’ve done to horse tack, I doubt you need both rows of rivets and four rows of stitching in each corner unless you want them for symmetry/aesthetics.
Another option would be to eliminate the overlap altogether and cut a separate piece of leather overlapping both sides. This has several things going for it:
- This could be done in a contrasting color for style points
- It could be extended UNDER the bottom to reinforce the corners where they contact the floor - a likely wear point.
- You could also wrap this piece up and over the top of the corner and stitch it in about five stitches to cover the raw edges of the leather, strengthening the upper end and protecting the stitching (another likely wear point as tools are added to the bag).
All the original sewing and riveting would be back, however…
If you made the inner U piece longer, you could integrate handles into both ends and draw them together above the box.