I am also a degreed architect - been using Visio for FM since 1996 in
various forms.
Been thru' many iterations of code to suit the tasks in hand.
The Space Plan is a reasonable place to start - probably more succesful if
you use embedded dwg files, rather than drawing walls etc from afresh. If
you do draw the building core with Visio, then it will save processing time
if you use an image of the building core as a background when you have
finished it...