Hi vwpieces!
Thanks for your answer, images and links! They will help on this 
I retrieved the chips from the damaged drivers, and unless heat has damaged them internally, on the outside they look fine! 16x7135 chips ready to be stacked :smiling_imp:
I still have some doubts but I’m still searching to understand the process as a whole! Yeah, I’m not savvy to read well all the charts or at least to interpret them without searching a bit on the basics first (V, W, lm, and that stuff…).
1 doubt I have is: the tab on the back of the stacked chip (top), does it have to be soldered to the bottom one? I read some things here (How-To: Add 7135 chips to a Driver Board (Stacking)) but as there are no pictures, it gets hard to see how it is concretized!
On yours, they seem to be, but on Richard’s video, I guess he didn’t solder the back tab…
The 2 lights I am willing to give more power have different pills and hosts, not like the S2+.
The S2+ would be my third option as I would try the others first, as an experience.
Stacking 4 chips per driver would be a reasonable amount of heat and luminosity gained, I suppose, right?
About soldering the plate to the pill, I never thought about that, but would that be a better way to dissipate the heat, then? So far I was going to rely on the pills and on thermal paste, as I’m not a soldering expert too!
And on the zoomie light I modded, there was no shelf, so I needed to improvise 
Maybe I can find some copper around, or I can order from anyplace!
I’m starting to learn some things so I appreciate the help you and others are giving ! Hope I can give in the same way
Next week I’ll start to try the stacking and post about the process!
Thanks again!
And good luck in the employment issues as well :+1: