Wiring from engine bay to roof the long way

I was feeling kind of lazy and didn't want to drill holes in my roof (although I already drilled 8 holes to mount my roof rack) to run wires for my lights up top. So I decided to run some 12-gauge cabling from my sPOD in the engine bay to the roof. I routed the cables down near the engine block, around the coilover bucket, along the flaps, behind the body mount, through the frame, across the inside of the frame, over the frame, and then up behind the rear of the cab's exterior. I know there will be power loss for the length of wire that I ran, which was four 12-gauge wires (2 positive, 2 negative) at 24-feet each. While doing this, I also ran a two more 12-gauge wires (1 positive, 1 negative) at 20-feet toward the bed for future use. However, all the lighting (all LEDs) coming from the gauges use 16-gauge or 18-gauge so there should be enough coming across by the end of it.

My question is, are there any problems I didn't foresee yet with what I've done?

Also, I do plan on cleaning up the look behind the cab instead of leaving the cables hanging freely (I just ran out of time today).

 

You might eventual rub away paint around where it touches the cab and bed(especially with the extent of wheeling you do) also not sure about zip tiring it to the post at the front of the bed but I think that would be about it