Hi Chris Craft
What a lovely boat to start on. Once cleaned out, make a card or paper template of the mouse eaten former, it lookes like it is balsa wood, cut a new one fron similar thickness, very carefully cut away the old former, looks like the glue is brittle but the hull looks like it is balsa as well so go carefully, the chewed inner edges to the deck could be patched with new wood let in.
Does not look like it had motors fitted but that would be easy to fit, with a rudder as well.
Painting may be a problem as it is probobly lead based paint, use a mask when sanding and clean well before you remove it. Acrilic paint would be the way to go, doesnt usualy react, but!!!! test a small area first.
Dont be to aggresive when sanding, remember its balsa and probobly soft, sand enough to key the surface then a coat or two of primer, rattle cans are good for this type of job.
Hope this helps
Mark