protractor tool:
-clic on the point of rotation
-clic on a line connected to the point of rotation
-you can now spin the protractor on your point of rotation, or set the angle with your keyboard
I layout spacing with the move tool
eg:
clic m
clic ctrl
clic on a component, group, or something selected
you can now drag a copy of same away.
clic to drop the copy
clic 2, x, enter
you should now have one more copy on center with the first two.
if you want more clic 3x, 4x, etc.
If you want to simply fill an area with centered copies:
do steps above untill:
clic to drop the copy at the other end of the area
clic 6, /, enter
to create 6 spaces between members
I've seen weird outlines appear in my models. It's usually time to copy the esentials to start a new file.