Pic1- Full sized Transom set up going together. The plates welded on the outer side of the bung area are to house the remarkably good Volvo QL trim tabs. Coming off the back of these plates is alloy tubing running from the plates inside the buoyancy chambers and up through the floor to ensure the chambers are 100% fully sealed to avoid any water entering if the Trim tabs leak or get smashed off. All that runs through the tubes off the QL Tabs is a small wiring loom.
Pic2- another transom pic.
Pic3- Planning strakes, keel and chines welded on.