I have bunches of collector's items related to kits I thought I'd build. MERCEDES 300 SL: Original parts, owner and shop manuals, including cases, plus factory brochures and flyers; original hubcaps, badges, grille star and barrel, and scripts. Similar materials for Jag E-Type. Repro and original factory brochures and manuals for Mercedes SS/SSK, Rolls Phantom II and Phantom III. All of which exceeds by many times my investments in the related kits. Of course, there are many research reference books and videos involved.