I would first look at getting further into what you already have. Seeing you are using DSLR here then you would need 2" filters and possibly a filter wheel. Jupiter revolves quickly so by the time you got to your last colour it would have shifted on axis and wont be able to line up properly.
I will do RGB in the future but I was to improve the quality with the gear I already have, perfect that then move on mods to get a little better.
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