Few would consider the Home Depo blank a real option. If you use your blank to practice outline cuts, and buy a real blank, I would share the confidence that other members have expressed. A CLOSE TOLERANCE BLANK will give you a perfect rocker, shape able foam, just cut out your planshape, and skin with a big surform, bring down the rails, sand, Glass with slow epoxy, or Suncure, for extra working time. You will net a decent board.
Some very valuable lessons for anyone are choosing your battles, and re-doing things to start over right, not throwing good money after bad, addmiting you got off to a bad start, etc.,
sickdog