Thanks for all your kind words. I've found out a prettty decent set of refpics showing an Atom during its build.
I will post later a clay render to better show the modeling (as the current materials are not so terrible)
About the engine I will put into it, I will model according to this refpic. Think it's the Honda, compressed version, 300hp.
For your information, Ariel advices not to use such an engine for unexperienced Atom driver