I've been giving Hakabase's modpack a try, and I've found that his modpack has a more up-to-date version of the Arpeggio Skinpack, this time without nearly as many bleach-white texture errors. The version in his modpack also takes less space.
Aslain, maybe you could look into the stuff that Hakabase has and see about getting a copy. You technically already have permission to use Haruna Line's skinpack, so I don't think anyone could call "stealing" on this.