I did mine, used sheet metal to weld up the doors and quarters. Bought a keyless entry systen from Autoloc.com. Welded up the manuel door locks so not have any accidents. I see you are in so ca I am on the corner of Tustin and LaPalma if you want to look at mine. I drive her every day it isn't raining or apart.Kendon ind.inc.
But from what does show in the diagrams, I think you will need to remove the inside panels.
The most frustrating part of how the manuals are written is how when you want to remove A the first instruction is remove B (see how on page x.xx). So you go to page x.xx and the instructions there say first remove C (see how on page x.xx).
So now you have removed C and B going back to the instructions for removing A and it says now remove D (see page x.xx)... And so it goes. Arrgh! :cuss