When doing a housing replacement, a lot of things can go wrong and it can be hard to figure out what is causing the issue. You need to reduce the number of variables.
I would start by testing a bare-bones setup. Start by disconnecting the battery first (always!). Then disconnect the digitizer, LCD, charging coil, front camera, rear camera and home button extension flex. Now re-connect the battery; you should only have the battery and Lightning Dock flex connected. Connect a known-good, preferably Apple-original Lightning cable to an iTunes enabled computer.
Does iTunes recognize your phone? If so, then you should re-connect one flex at a time until the phone stops working. I would start with the charging coil, then the Home button flex, then add the rear camera, LCD & Digitizer.
If the bare-bones setup does not get recognized by iTunes, then you most likely have a logic board issue. You could send it (or find a local) to a repair shop that specializes in micro-soldering repair.
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