Hey Phillip...what are the chances you'd consider producing a pattern design course? I suspect I'm not the only one who would be thrilled to see your tips, tricks and techniques to go from a concept in your mind to a functional pattern.
The De Havilland bag would be cool but really any non-flat design (that requires working things out in 3 dimensions) would be amazing.
Hi Chris! That's precisely what I've asked Philip too, some time ago!
In my opinion, that's the no. 1 skill of any respectable leather craftsman. You may have the technical skills, but if you can't translate your imagination into reality, that's almost useless....