Les,
'Fraid I must concur with Noel. By the time you've fitted an NVR switch, made a blade guard etc you'll probably be well on the way to a low budget T/S. And despite the well-known inaccuracies of those machines, they'll still be more accurate, and safer, than an inverted tablesaw IMO. What d'you want to do with an inverted saw that you can't with it the right way up? Perhaps we can point you towards some tips or jigs that'll help?
Cheers, Alf