So, I got a log...

[redhandfilms]

Do you have a hand drill or auger? Great for drilling a bunch of holes close together and then chipping out the rest. I've never done anything as large as a canoe, but it works well for cups, bowls, boxes, etc. Burning out as Eofor suggested is also a very traditional method. Multiple, low, controlled burns. You could even turn it into a barbeque event. haha!

[Greg]

Have you considered burning it out Greg?

Unfortunately, there are portions that have to be, essentially, "undercut" for this particular design, and so flames would too easily burn parts of the boat that I need to remain intact. Definitely already thought that one through thoroughly.