I can help a bit based on studying these bikes at length but the specifics of your questions are beyond what I can answer with certainty, and beyond definite answers based on what is currently accessible for ready research in the public domain.
Your CWC Roadmaster can be visually dated to a production period ranging roughly between late 1946 and the end of 1949. If B08828 is the entire serial number and there is no suffix following it, then the bike probably was manufactured toward the beginning of that period.
Your bike looks generally complete and correct as it sits excepting the paint and other condition issues. It is a bike from the middle of the line, it sports the New-for-47 Girl’s Luxury Liner style frame but it has the lesser tank, rack, chain guard, and light (having the light is a good score because few bikes from this period still have theirs.)
You would need to consult full-line Roadmaster catalogs from the period to ascertain more about this bike, its model designation, and original color options but CWC literature is not easy to come by in the public domain. The one source I am aware of that can produce that type of information (by individual request and for a nominal fee) is the National Bicycle History Archive of America (NBHAA.)