The 7'8" width seems to be a big problem. My 20' boat is 7' wide.
Flying Tiger 10. Not an ocean-going boat, tho.There is a company that is building container size sailboats. Read about them about a year ago. The boat is partially disassembled and inserted in a container. A tight fit but it does fit.
If you want pics of the boat here in Asia please let me know. I have seen one fitted in to a container....tight fit but it goes.