Sansui SP-2500 - Keep Original, or Modify?

In-looking (locally) for a Heresy-sized, high efficiency floor speaker (little kids == no towers, stands), I've come-across a 99% mint condition pair of SP-2500s, and for a song. Admittedly I am not one to keep things 'original', if quality is being sacrificed. I was thinking of rebuilding the mid/high section with new mid drivers, and a ribbon tweeter (and removing the HF 'lens'). Some crossover work, as well, of course. 

Does anyone own SP-2500's, and have you modified them in a way that is to your liking? Or would a guy be better keeping these, as-is?

Thanks!