Absolutely a doddle.

All you need is Baby wipes ,super glue,and baking soda.
The mistake you've all made is your building a whole boat first. There no need to plank the entire Hull.
You just put the keel and ribs together and deck as par kit.
Then plank from the water line level you want .All you do is turn thing upside down so the deck is on a level surface. Then mark the height / depth of the water line on the ribs and keel.by drawing all the way around the thing. Plank from that point up ( probably four planks.) Them use the old baking soda and super glue trick on the inside of the planks where the attach to the ribs all the way up to the underside of the deck. Then you simply cut away the unplanked section of ribs and keel. A little light sanding and it's ready to add the superstructure and furnishings.
(Failing that it's a very simple cereal packet build

)