Paul
Paper thin wood turnings, show the skills and techniques of the craft have been mastered, they prove to other turners that the creator has a gentle touch, a sharp tool, and a good eye, and reflect great skill and care and justifiably both turner and piece command great respect.
I think the simple straight side form you have made is the easiest and simplest way to achieve the paper thin bowl, and must say you look to have achieved it well, with out seeing the piece close up, it looks as though you have a great finish on it, you have kept the defect (the knott hole) and I like that, it does not conform to the general concensus that paper thin must be perfect, I am a great non conformist, a loose cannon myself, and think that if everything in life was perfect what a boring **** place the world would be, I like defects, highlight them, make a feature of them, its natural and should be regarded as a highlight.
I think Paul, with this piece you achieved what you set out to do, and you did it well, if this is the way you wish to go, ie technical turning, paper thin pieces, you are well on your way, however I think that that type of turning is at the expense of the natural beauty of the timber, and if I where you, before turning do as I do, place the chosen piece of timber on your work bench, pull up a stool, light up a ***, have a cuppa, and look, study the timber, see where the grain flows, see the knotts and features, let the timber speak to you, (it's not a hippy thing, and you dont need to be on drugs) it will tell you its shape and form, then all you have to do is turn it.
Forget paper thin, you have done that, let the wood talk to you.
Chris