Go to the lumber yard & buy 1" thick x 10" wide premium white pine 8' boards at $0.85/linear foot. hand sand all the edges so they aren't sharp/look older. Then cut them in a staggered length & place down to assure u like the pattern. apply PL400 subfloor glue along the bottoms & lay them down butted up board to board (the sanded edges provided some small gaps between them for character.) he used a nail gun/compressor with finish nails for extra hold. Apply Watco Danish Dark Walnut Oil.
Farmhouse wide plank floor tutorial, done using PLYWOOD! AMAZING! Been trying to figure out how to do plywood floor and this is IT!! If it looks as good as I hope, I'm doing it everywhere!! would love to do this!