Thanks for the kind feedback you have all given.
Bruce I am happy to answer your questions people on this forum have always been helpful and answered mine.
Did you use a stiffner behind the leather?
I did not use any stiffener behind the leather the bag is filled with fine sand to give it some weight to help stop it moving about.
Is the lower vertical secction thats monted to the base wet formed?
No not in the traditional sense. I did however dampen the leather to help form the fold but nothing more than that.
How did you roll that lower edge leaving a flange and an inside fillet without tearing / cutting the leather?
I assume you are talking about the black centre section. Once I had formed the vertical piece I then stitched the centre section in, this then wanted to straighten the fold out. I then dampened the edge again and with some persuasion and brute force you end up with the front edge just running smoothly down and once its glued and stitched its not going anywhere.
It was not that difficult to make, what was hard is making sure everything is done in the right order and the patience to wait for glue, stain and damp leather to dry before moving on to the next step.
Hopefully my answers make sense but if you would like any more info just ask.