for line drawing use these functions:

rel_to_screen (VECTOR* vector, VIEW* view);
draw_line(VECTOR*, COLOR*, var alpha)

look the up in the manual to see exactly how to use them, all you'd have to do is take a invisible box model scale it up and vec_lerp the distance between all 8 vertices to about 20% and draw from the vertex to that point

edit: Also carlos, sorry for hijacking your thread, the game looks, nice, i like the editor, and i have no idea how to fix your problem cuz that is how i would have done it too