What LEVEL of involment do you WANT .. Do you want TO DESIGN it very precisely .I MEAN build a MODEL SIMULATE it . Do you want to UNDERSTAND all the TECNOLOGY or you JUST NEED a PROJECT on how to MANUFATURE it??
I don't get the point why you would want to build a motor when its easier and cheaper buying one.
Btw you can easily build a working model of motor but it won't be compact,usable and efficient like the commercial ones.I had built one just to demostrate how motors work.