Also used these guys.. 5 yrs later and still very very happy. Also they will build in hinges etc so you can get to storage under the berth.I used these guys for my bed. The bed was great and the service was really good. The factory is in Southern California, but they do get around and will ship anywhere.
Handcraft Mattress Company - Custom, Innerspring & Latex Mattresses - V-Berth - For Marine Environment