..................
My next project will be a solid bridge, haven't figured that one out yet but I'm looking forward starting the project as soon as I find the right material, synthetic or hard wood.
My Rogue VB100 came with round strings. To me with rounds it sounded too much like my other solid body basses. I bought the VB100 specifically to reproduce the deep thump tone of 60's British invasion bands. IME flat wound strings and a hollow body bass provide the easiest way to the specific tone I wanted.
About replacing the floating bridge with a solid bridge (I'm assuming you're talking about something like those used on non-Gibson solid body basses, i.e. Fender, Ibanez, Lakeland, Music Man etc.) might be a major reconstruction challenge due to the hollow body mature of the VB100. There is no mass under the top to support / mount a solid one piece bridge. Screw one in and it will most likely pull loose or collapse the top or both. Watch this video on the construction of the Hofner bass to get an idea how the Rogue is put together (there might be minor difference, but not many) to understand why the VB's hollow body design requires the trapeze tailpiece and floating bridge construction. If you can design a simple and permanent way to install a one piece surface mounted bridge I'd love to see photos and descriptions of the step by step details.