I think getting half the price of a flatbed for your pickup bed would be doing pretty fair.
The only shop in town wants $2650 for the bed. Supposed to include everything. $100 to take mine off, and are offering $700 for my bed. I called one body shop, and they also offered $700. I think I could do better on both ends, just nobody here to price either.
That sounds reasonable to me.
I would not consider having a work truck that didn't have a flat bed. After having about a dozen.
Don't put any lights on it that are not required by law. Lots of cops and state inspections , think if it's there it has to work.
If your going to get off the path avoid underbed tool boxes. I've never had one I didn't end up cutting off.
Make sure a good job is done on all wiring. This always seems to be a problem.