So far, I've managed to sand nearly the entire enclosure (that took 4 days), but I have to go back and finish the hard-to-reach areas with a small sanding tool and I still have to do the front door.
Kevin has spent the week transforming the the hatchery into a fully closed greenhouse. He's adding plastic sheet all the way around (as walls) to keep the cold out. We hope this will improve our rate of growth. Yet another experiment, so we'll see.