Strictly I.C. Magazine
Is a good source for motor designs. I believe there is an index on line to I.D. which issues might be of interest to you. They are no longer publishing the magazine (current issues). But all old issues are available and it's a treasure trove that I wouldn't give up for anything. I'm just getting my skills in order to make an ascending scale of the various motors that I find appealing (at least that's the intention).
Allans Rule: Anything worth doing is going to be a pain in the butt.