Dividers are far better, but they need to be tight at the bottom and sealed. For that lead free solder is fine. If the person who would add the dividers is not familiar with either SS soldering (or better yet, welding light ga SS) I would get a new pan. They should be about 22Ga SS, but for the dividers the ga is not as critical as the bottom of the pan.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.