прошу Вас помочь с переводом словосочетания "detailed construction concept including constructability studies" в нижеприведенном контексте:

"Contractor indicated several concerns with respect to Construction performance where potential for improvement is seen, i.e.:
1) A detailed construction concept including constructability studies is elementary for a successful construction execution.
2) The basis of a successful construction execution is a proper material handling and storing on site (databased Material Handling Management System). Based on Contractor's site visit the situation on site must be improved quickly."

Большое спасибо!