I guess that you are able to plot the 3D figure 'anywhere' within the axis, i.e., that you can translate and scale it the way you want. (if not, simply try to subtract a certain offset from the x and y coordinates; scaling is a little harder).
Now, plot the 3D figure at the position of the first point. Then type
and plot all the others. Then have a look at your figure from directly above:
(or play around with the view command until you have found the right angle to look at your figure if you happen to look at it from the side).