Technically, you don't need to do much. Media and cigars will do it if that's as far as you'd like to go. Wineadors are really very custom, personal creations.
You can put in metal racks - economical
You can order drawers from one of the reputable sources from this thread: Chasidor vs. Wineador wine cooler drawer review!!!!
You can buy spanish cedar and make your own drawers, or shelves, or line the wineador - or you can skip that. Some people cut up boxes and line them with that. It's just to hold RH, so it's "extra", depending on what you want and what kind of look you're going for. I saw a really neatly lined one earlier today, and I've seen ones with a mosaic of boxes on the inside.
Some people add fans and lights, depending on their setup. Whether or not you have drawers or boxes, and what kind of racks/drawers/shelves you have will determine your need for a fan, based on keeping RH equal throughout the wineador.
But really, you could just put kitty litter in the bottom and cigars in boxes on the existing racks, and you would still have a working wineador....
so it's very much up to you- let us know what your ideas/goals are, and I'm sure plenty of members will have more specific tips and tricks for you. Browsing some other threads about wineador builds is of the utmost help as well, for ideas and solutions to potential pitfalls, etc.
Regardless of your choices, best of luck to you - and remember - pics or it didn't happen!