Boondock
For the pot you have shown in the last reply 1/2" seems a little excessive, IMHO. I only use 1/2" thick slabs for pots that are over 12" in length, using 1/2" slabs on pots under this size seems too heavy on the eye.
When I make shohin pots I use 3/8" or 2/8" slabs this, for me, is a nice proportion.
Don't get me wrong there is no right way, I look at what the tree demands. If the Bonsai is delicate and feminine then a thin delicate pot is appropriate. If the Bonsai is powerful and masculine then the pot should reflect this. I find dsing this approach achieves a union between the tree and the pot.
Hope this helps
Regards
Andy