I'm still browsing 2005 but a quick count indicates that given the ingredients, time, and skill one might make 3 of the 5 Cocktails, 4 if you have a chamber vacuum; one requires liquid nitrogen. Looks like about 25 of the 35 Snacks are "within reach". At least one requires an ingrediant, Lay's 3Ds, that is no longer available and several involve freeze-drying (LYO in the title, but a good number of the LYO ingredients are available ready-made). That's as far as I've gotten so far.
There are quite a few recipes that call for a superbag - there's a discussion of them on this site. A bigger expense would be a chamber vacuum (anything with CRU in the title) but as you know they have many "normal" uses as well. Of the remaining relatively normal equipment, the Thermomix shows up fairly often - the same price range as an oil pump CV but also useful for more than just elBulli stuff. The chemicals, ISI Whips, etc. are all easily available. Not too many of us home cooking maniacs will buy a dewar and liquid nitrogen (nitro in the title), but it's not out of the question if you can source the stuff. The Pacojet is probaby out of reach for nearly all of us.
The internet makes sourcing ingrediants relatively easy but you'll certainly have to approximate some, particularly the fresh seafood itemsand very seasonal fruits, vegetables, and nuts. There are also some purpose built items such as molds, special serving ware, etc. one would have to fabricate or approximate.
I think it's very reasonable for one person with reasonable planning skills to put together a Cocktail, 2 Snacks, 3 or 4 Tapas and a Dessert for an "elBulli Tasting at Home".