Once the front floor area was done I could start working on restoring the 110 volt system. Originally the shore power cord ran into the baggage compartment door and then into a simple metal junction box at the front driver side corner of the trailer. From there romex wire went into the wall and to the 30 amp service breaker box which is in the back trailer wall, in the closet area.
I did a continuity test between the old junction box and the breaker box and the circuit checked out good. I also checked continuity to all the wall plugs and those checked out as well. In this trailer all the wall plugs are 110 power, everything else is 12 Volt. This makes for a very simple 110 system, only 2 circuits. One circuit services only the wall plug in the front driver side area, where the converter plugs in. The other circuit services all other wall plugs.
The cover to the original 30 amp service breaker box was missing so I had my local metal shop fabricate a new anodized aluminum cover.
I then replaced the old shore power cord with a new 25ft. long one. Instead of a junction box, I installed a Progressive Industries 30-amp service surge protector. This hardwired Electrical Management System is a top of the line unit. http://www.progressiveindustries.net. It was not cheap but considering the damage a power surge can do to modern electronics it is totally worth it. It gives me great protection and absolute peace of mind as to the shore power I am bringing into the trailer. It is a solid piece of engineering. Their You Tube installation videos are very clear and useful.
I started building the front seat frame under which all my electrical systems will live and installed the surge protector:
Once everything was wired, it was show time. Surprise, surprise!...It worked!
It was nice not to need an extension cord from the garage to run all my power tools, lights and electric heater, from here on out just plug them into the wall. Soweeet!