This is tremendous and timely information. I'm about to build a guitar amplifier cover using the exact technique described here, essentially an upside down "messenger bag" style container with no lid, but the top, front, and back will be one piece of leather, and separate pieces for the sides. Sjohnsone, very nice bag you made! I think it looks great. Looks like my old "mochila" from when I was a kid!
PepeUnidos