jamesdak 

OK, it it helps. My "bike cave" is a 12" x 12" room. I can easily put 30 road bikes in there in a way that are all easily viewable. I can also easily pull any of the bikes out for my daily ride with minimal effort. In fact I could easily take some banners off one wall and hang yet one more bike up. I use a combo on hanging displays and then one old 4 bike shop rack and a bunch of two bike racks side by side. With those I have a row of bikes that alternate front in to back in so that I can fit them in closely without banging into anything. Some pics from over the years to help show this.