I can honestly only comment about the corners. Curves are where your equipment is most likely to leave the track if speed becomes excessive, whether accidentally or purposefully. If you choose to angle the corners, please put up some type of fall barrier protection along the edge to prevent your equipment from hitting the floor. Also, why remove good scenic opportunities just for better aesthetics. Most modelers are looking for that little bit of space to insert a scene they have always wanted, but only recently could acquire.
Chuck