Quick update, I've added a few locations that didn't have size stats . Hope the numbers I've used seem reasonable. :) Edit: It occurs to me that giving the reasons for the sizes I used would be useful. Titan Cities: The dome of Nyhavn is described as being "several kilometers" across. Lacking anything better, I chose seven as a good sized dome. The smaller domes of New København and Telemark city use the same dome size as Aarhus and New Quebec. I figure that there are two dome sizes - 1.5 km and 7 km built using a modular shield wall mold and prefabricated buildings and dome . I'll resist the temptation to make an IKEA Dömê joke here . Most cities are built using the 1.5, repeated as required. Only Great Nyhavn uses the 7 for a dome, usually just the wall is built around a skyport. Old Nyhavn being the smallest I used 800 meters as a fair sized starting point. Progress : Getting a good size for Progress was hard! For one, it's got a large population and is described as "one of the largest " Cole bubbles in the Solar system. After trying a lot of rather large sizes I settled on one that wasn't much larger than Deimos already is. Basically it came down to numbers that were divisible by 6- 12 km diameter at the midsection and 10 km diameter at the poles with a length of 18km. On a purely aesthetic matter, I made the windows a series of long rectangles to fit the "cut into the side of the cylinder" description. This leaves the center third "beltway" intact for the Consortium HQ. I put a 1 km dock based on the sphere at Selene at either end - and called the dock at the Tangles side of the habitat the Marina because you know it going to be full of hypercorp status symbols . Aspis, Qing Long & Solano : In Sunward both Remembrance and Qing Long are described as the largest O'Neill cylinder in the Solar system. Since we have dimensions for Remembrance I kept that biggest in total, and made Qing Long the largest [em] single [/em] cylinder in existence. Solano has a diameter of 30 km and if it followed most cylinders conventions of a 1 to 4 or 5 diameter to length ratio it would be a match to the Long Array! So, to be appropriately huge yet give Aspis room to be longer I made it 100 km long. Speaking of Aspis, to make it the longest habitat ever built without being the largest it would have to be relatively narrow at 3 km and each of the six segments at 20 km making it 120 km total - comfortably huge but not longer than Long Array!