good question :)
the base of the esc is 100.1 mm and here you see its bigger than the esc in length
I would say about 13-14cm in total lenght for the CC motor?
I think that kit of yours + this CC combination + a Hyperion lipo would give a nice alternative to a Baja? :) And I think much cheaper?
ps nice website, its not online but promising pics
http://www.alza-racing.com/soon
and I bet if you make some advertising of your website, you would get alot of orders for your kit as soon as the Castle Creations combo hits the stores :)