You said that you didn't like those bolts sticking out that held the fire extinguisher bracket...you could either re-use the bolts/braket mount and put grab irons or a lift ring on the out side. You can also make a housing to hold some outdoor cb audio equipment if you don't want it to fill the cab.
You need to have fuses as a safety feature. However since you have to redo it all anyway use an automotive style box with blade fuses or marine grade box with blade fuses
