Same here, and same still on paper
Been doing some theoretical work on it during my more boring times and have (theoreticly) solved some questions on boyancy and balasts.
I'll resolve engineering problems when I encounter them, which is not going to be so soon, since I don't have the resources (€€€€) to begin a project of this size.
Maybe we can start a Subsim fund raising event and we'll build a working replica of a type VII
