Hi @cooljjj33 ,
I still don’t understand what you are trying to do, sorry.
A Solidify, constraining the Z-Axis?Do you mean something like this (yes, I know this is not a solidify):

Why (and how) do you want to Solidify that girl anyway?
And what do you imagine with no overlap?
And what’s with the Poly Splice Addon? That almost sounds like you want to 3D Print this….(and I know absolutely nothing about that.)