[BruceK]

Sounds underdone. I gather all 3 sections, bow, lazarette, and centre communicate. Is the central area where the pumps are deepest? If so,upgrading the 650 pump to 2000 would be a good idea. If separated,3 systems would be needed but sounds like it is intended all water drains towards the center. If the one with the tube to the deepest point does it`s job the other(s) should never be needed but I`d regard the existing 650 as the main pump, and give it a backup pump, mounted higher, similar capacity. Give some consideration to the switches, the Johnson no external moving parts version beats flipper switches hands down imo. Alarm indicators at the helm would be good.
The ST44 certainly seems to have its share of design/fitout issues.