Most impressive. that would be an interesting model in itself. Well painted and weathered as well.
I dont know how thick the plastic is for the outer shell but would really good if it was thinned by the holes/vents. I think it would be the icing on the cake. Sometimes the plastic is so thick that it is thicker than the hole is round and spoils the scale effect. Sometimes you can get away with just thinning the back of the part down and open the hole that way, without the need to drill. You said you had a 'Dremel' right`?
Steady as she goes and top marks for doing it in the first place. a lot of folks would just paint the 'Holes' black, to the detriment of the finished model.
Looking nice and neat and then when the slots are all done, the boat will look 'Ace'