Note
OCAD problem was that I didn't realize Parallels was defaulted to 2 GB ram, which was not enough to do the vegetation step for a small park.
Now that I have that, I notice that OCAD can only convert height from feet to meters, so I have to remember how to do las2las to try to get the files all clean up in meters (source may be all in feet) so I can overlay the trails, otherwise it's kind of an imperfect operation to scale and align, unless I knew more.