вот контекст
The project scope consisted of (including project and quality management and reporting):
Preparation of 4 island substructure concepts and evaluation of these designs on environmental impact, constructability, schedule, costs, execution risk and decommissioning.
Further elaboration up to final design concept for the selected island substructure concept.
Design and engineering of concept topside foundations designs

и мой вариант:
Конструирование и проектирование по концепту фундамента для верхних строений