So, I'm new to Hammer, though not entirely new to mapping. I've also sunk far too many hours into TF2, lol. However, I have a couple questions: 1) I hear it's advisable to stick as close to a 64-unit grid as possible. Will flicking between grid sizes to position geometry have any negative effects? Or is it mostly just for ease and consistency? 2) When connecting walls at corners, is it better to have the brushes literally touch corners and nothing else, or is it okay to just place them with their faces flat together (i.e. the whole base of a wall sitting on the floor)? Providing they never overlap, of course. A few tutorials I've seen chose the first method. I'm guessing it doesn't matter beyond texture alignment. 3) I assume there isn't any in-editor indication of how many props and brushes is too much? Like, besides actually playing the map and recording your performance first-hand. 4) How expensive is water in terms of performance? Thanks.