Spent the morning getting World Machine set up, ironing out issues with WM-Unreal on a 1 to 1 ratio... and there were a few more issues now that I only have Standard version, instead of the Pro I had at work. The issues are in WM and I sent them an email. It will be very hard to work with it in this setting configuration as it stands now.
As for the why, I love WM! I like getting a natural base for a level with the procedural elements that makes designing around them actually fun.