Here's my current one. I made a space lab style one first. In a previous campaign/career game I had another some others (Kerbin, Minmus, and a tiny one around the Mun), but this is so far my most extensive - combining stock, Station Science, and OKS. Mostly assembled with clampotrons (haven't unlucked the big ones yet though). I am adding a section that will house the resource tanks - mostly fuel, and will soon add an ISRU, though I expect a more significant fuel processing station to be build around Minmus just due to the economics. This one will probably continue to be a science station, but will act as a staging area for missions between both moons and Kerbin. This also seems to be acting as a Command Centre for Remote Tech.