( This is what I would do. Unfortunately I don't have any tips for funk, however this may be more beneficial )

I recommend that you disregard typical structures and instead form your own structure around the material you have present. For example, if you have a really great melody and rhythm section, but no lyrics, do not use a vocal music structure. Instead perhaps, do something like this.

Melody is Introduced -> Combined with Rhythmic portion -> Develop both of these two strong points -> Breakdown (perhaps do a call and response type of thing) -> Bring back the fully developed melody and Rhythm -> End

This would not be a very typical or standard Funk Arrangement, however, if you follow the strongpoints of your material, a great piece of music will be the final product.

Peace and Good Luck.