Make cockpit seat mockup/template. Make and paint engine drip tray. Glue and fasten in engine beds. Rout to correct height. Glue and fasten in shaft log, shaft tube, and strut to hull. Make, paint, and fit muffler box mount. Attach cockpit support ribs and mounting blocks. ALign and bolt in engine. Trim proptube for shaft seal. Prepare for and fit flexible engine coupling, shaft flange, and shaft seal. Paint as required.