Hello, I'm a fresh mapmaker and I have trouble modeling a specific object. I'd like to model an observatory, something looking like this: http://astroprofspage.com/wp-content/uploads/2007/07/p200orion.jpg It is supposed to be a central point of the map (I though I'd start off with a KOTH map being the smallest and simplest map type). The observatory itself should be half of a sphere dimensions 1024*1024*512 (length*width*height) which is hollow with walls of 64 thickness sitting atop a cylinder dimensions 1024*1024*256 which is also hollow with walls of 64 thickness. The half-sphere part of the object should have one side missing (let's say 2/16th of a 16 face sphere) to represent the opening for the telescope. How would I go about creating such an object? I've tried both making it hollow and carving with another smaller sphere but both ways screw up vertices badly making it nigh impossible to cut out the opening for the telescope. Is there a way to manually draw vertices? Any advice is very much appreciated!