Oh wow. That looks like a major do over. Hopefully you used water soluble wood glue. I use Titebond glue and found that a cloth soaked in very very hot water laid on the planks will loosen the glue and allow one to remove the planks, Messy and a lot of work. I agree with Heinrich, push pins are the way to hold the planks in place. I learned the hard way that a plank needs to be fit checked several times before it’s glued in place.
Jan