Much of the light fixtures etc will also require a redo as the new light and shadow settings set the lights as much brighter than the legacy engine that was only able to render so many lights at a time. I am not sure if the light & shadow code is settled enough to start making the alterations. I went ahead and dulled down some of my "too bright" lights just in case. Redoing the light fixtures was easy as I simply edited the scripts inside them.
Redoing prim items as mesh will be a much longer, much more laborious process and will require me to learn a whole bunch of new skills.
I used sculpts in my furniture due to market pressure but I made few sculpts and bought most of the sculpts I used. I was never happy with the sculpts however as they performed terribly with LOD (level of detail) settings.