I have a local saw mill where I can adequate supplies of red oak. Pauls bench can be built using southern yellow pin. It is now expensive and is plentiful even in big box stores like Lowes and Home Depot. Look at the end grain and select either quarter or rift sawn. Either of them is warp resistant because of grain direction. For about $200 you can more that enough for the bench. You will still need to plane it to remove the milling marks. It can be beautiful wood. Look at the site for Taylor Chairs. He made one of the same pine…bought at Loews. His sculpted rocking chair is every bit as beautiful as Sam Maloof’s. Keep your tools sharp and work safe.