IMHO, the "Signed, Numbered or Lettered Editions" should stay with the books only. Couldn't things like the Cujo guitar, portfolios, etc., be moved to the "Miscellaneous" catalog? Maybe create a "Signed Miscellaneous" catalog?
I had a tough time with these 'categories' while I was organizing my own collection. Aside from the multiple categories for actual SK books, I ended up with these categories: SK In Collections (i.e., dystopia, 999, Borderlines 5, Moth, etc.), Books about SK (i.e., Bare Bones, Fear Itself, etc.), Magazines (i.e., Cavalier, F&SF, etc.), Movies, Comics, and Miscellaneos (subcategorized by promo items, portfolios/artwork, etc. - my Cujo Guitar is "Other" under Misc). All that might be a bit much for the catalogs on here, but I'd be willing to help!!