I see no problems using rough cut lumber in hive construction provided the wood is properly seasoned. I should expect that due to the woods rough texture the bees will tend to propolize it a bit more than planed wood. If you desire to have your wood planed the width of a hive body is well within the range of just about every thickness planer out there and I am certain you could trade a jar or two of honey with a hobby woodworker for the job. Or barring a planer a course grit belt on a belt sander would smooth the wood In any case the bees won't care if the wood is planed or rough. Beekeeper woodworker sharpener