Putting non-original wood in LWB Stepside

[airbrushguy]

Want to put five 1"x 10"x 8' oak boards in my '71 stepside. Will still use stock sills and am using SS strips between.
Has anybody done this and are there particular problems with trying to do this?
Not interested in originality, just a good quality floor.
What would be the order I should assemble and drill everything? The bed is presently off the truck and standing vertical.
Should I bolt the sills with a 1" x 3/4" strip of wood running down each side and then drop bed on truck and install boards and strips? Will I run into trouble trying to figure where to put bed mounting bolts?