Task Force Bed Wood Dimensions

[thumper56]

Greetings All,
I'm approaching having my bed sides and associated parts in paint, I'm getting ready to purchase my missing bed sills (all of them) and thinking about bed wood. Truck is a 56 short bed.

I operate a small cabinet and furniture business so have whatever I need for milling lumber and also have a fair stock of rough sawn cherry and maple. That said, would like to save some $ and make my own bed wood.

I see on the web that eight pieces of lumber are used- varying in width.

Can anyone answer the following?...
1) How thick are the boards for proper fit?
2) Looks like rabbets are cut into board edges for rails to fit into- how deep? Assuming about half thickness of rails.
3) Outer boards rabbeted to fit under side "L" on bedside- again how deep?
4) Boards just butt fit under rails, right? No tongue and groove?

Thanks a bunch for any info. There will be a lot of trial and error fits, but hope to keep to a minimum.