I wasn't considering multi-angle, as the French discs have the crawl in English but with subtitles in the lower black bar. Presumably I could do the same but with German subtitles.
My current plan is to finish an English, non-anamorphic, movie-only (no menus), single-layer DVDR set. I'll make these available for feedback purposes, and you could put your own soundtrack to my video if you want to have a go.
When I've finished this initial "taster" set, I'll go back and look at enhancing the set with multiple languages, anamorphic widescreen, menus and maybe make it dual layer then. Unfortunately this "final" set looks to be a long way off at the moment!