thinking about making a long bed a short bed

[kwin]

I have a long bed on a 87 that has some damage in the filler area , brand new panels that were damaged by a drunk driver, I am considering cutting the box down to make it a 6 foot. Has anyone done this?
I have fab skills and as well as tig, mig , plasma and all the toys.

If I decide to go forward where do I cut and how much gets removed front and rear?
I know it would be easier to find a 6 foot but this is a basically a new bed that needs work either way. It was restored and waiting for paint and was hit by a drunk driver.

Thanks

Keith