Just reporting as I haven't been able to found anything on installing Drafstsight 2018 on Leap 15. You can choose to break dependency on libaudio.so.2 which seems to be network audio server. After installing Draftsight works.

For those who don't know, Draftsight is free as in beer (not as in speech) 2d CAD AutoCAD like (most commands are identical) software. If you were looking for AutoCAD alternative for Linux Draftsight is very good.