Bulkhead Delete

i have. mine had a few melted cavities.
tips,
A: have a factory manual
B: double check someone hasn't re-routed something and that all the wires are in the right place
C: learn to read the manual before you start cutting
D: pull the front seat and put some packing blankets on the floor

i unplugged everything on the engine side and popped out the cavity fitting from the firewall. that way i had working room. i did one at a time. i would not recommend soldering, current consensus seems to be quality crimped connectors are better. i used THESE style butt connectors with a double layer of shrink sleeve over each splice. use GOOD crimpers. i use sta-kon pliers for this style connector, (because i had them), but there's others out there. i also removed wires i no longer needed and added a few new ones. everything worked first time. you need to workout how you want to seal the hole too. at the moment i just have a block off plate i fabbed since i moved where the harness goes into the engine side.
i am going to redo mine. i want to re-route the main harness under the fender and get a cleaner look, but just removing the plug is not that big of a deal.
of course if you ever have a problem you might be cutting instead of unplugging something to fix it...

good luck