I think a limited colour pallette always works best with most bikes. I try to limit my builds to two colours plus silver and black.
That way you can avoid unsightly clashes.
The DeKerf looks great because essentially it's blue, grey, silver and black, and as such looks very classy.
I think your Fat needs to loose the purple bits and needs a plain leather flite. I also don't think the red cranks work on this bike.
Not sure what to suggest for forks though but I like LGF's suggestion of some custom sprayed Mag21s, but not the Indys.
In summary Dave, it's got potential and I reckon you've got a good project on your hands there.