Sorry, it is the opposite,
"izvođački projekat" would rather be a
design (detailed one) in the meaning of a "set of documents" (plans, etc), please see here:
http://en.wikipedia.org/wiki/Engineering_design_processDetailed designThe detailed design portion of the engineering design process is the task where the engineer can completely
describe a product through solid modeling and drawings.
Design = projekat;
glavni projekat (jedna od faza u procesu projektovanja) = main design (nikako main project)
designer = projektant