I know what you are saying about the sugar gene making patterns crazy but as with all morphs there are different 'severities'. I have hatched out sugars with 'normal' patterning and lots of white and I've also hatched out sugars with hardly any white but very whacked out patterning. All depends on the individual animal.
I posted that link to the pewter calico because I haven't seen any pics of pewter sugars to show! Nearest I could find.
On the cinny x sugar project, have you seen the super cinny calico, not what I hoped it would be...