Oh. I had a truck like that too! 1978(?) Chevy LUV (Isuzu pickup to the rest of the world). By the time it was through, it was several shades of gray and blue, the floors and fenders had this nice stucco look from unsanded fiberglass sheets and mud slapped on, and lots of that polyurethane foam to keep the rain out.
It was never a thing of beauty, this was about as basic as a little truck can get, without a radio or even a headliner. It did have a heater, though, and since there was no weight and a standard transmission it was a blast to drive.
The truck make its way to the junkyard on its own power, but when they picked it up with a fork truck the entire thing broke in half; apparently there was nothing left of the frame between the cab and bed. "OMG I was just driving that?!!"