Overhead cranes

we are looking to participate in a tender to make a modification for the overhead cranes.
scope of work:
uninstall old brake, control and hydraulic power systems for all 4 overhead cranes: 50 tons/5 tons qty=1 and 30 tons/5 tons qty=3
install a new electric thruster without any removal of all other system parts and using
(retrofit) system and install a new control system for direction control and speed. powered by available 380v-3ph and controlled by electric pedal
preventive maintenance w