I use to map with Hammer for various mods(TFC, TF2, CS), though I never really got serious with it(only finished one map really and it wasn't to popular though did get played on one custom server a few times). My question is simply should I pretty well use the same techniques picked up from Hammer? Such as no hollowing out rectangles(manually making each wall), don't let props actually touch the level geometry(1 unit off, though if I remember right TF2 didn't require this), etc? Another words is there anything I should take note of before starting on a new map I designed? Thanks for any tips, I read through both guides already and never mentions much about actually building the levels.