This video here is from a Guy I've learned some decent stuff in the past. If your going to do this anyway then use this link.
Some custom mappers have noted going with a resource downloader when their maps reached 500+ megabytes in size which causes problems when downloading a single file on an unstable connection. If you store materials models and sounds, the person will be downloading 1 file which is much simpler but it bloats the map file to incredible sizes. Yes it is possible and no its not always the best idea.
