I live in an area where there's lots of guy cutting Bluestone. Most use and older trucks and put a wood flatbed on them. Most (read 'All') use rough cut hardwood. There pretty much framed up just like you would for a deck on a house.
I looked into doing the same on my '87 last year because I didn't like the price for the beds I was finding. I ended up finding one at a junk yard 'for cheap' and putting new wood into it. It came out real nice, after I cleaned the steel real good and painted it. If I end up parting out the truck - it'll be for sale. I know that's not alot of help for you, but next time I'm at my yard I'll take a picture for you (if you want).
White oak would make a good bed, plain one side and you can get a nice finish,I like Cabot's 9200 natural for protection. Also durable and tough would be locust, a lot of guys around here use it instead of treated lumber.
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