So, I went ahead and cut the bow down by an inch and a half on each limb, and then cut new nocks in an inch and a half below those cuts.
It was 75" ntn (nock to nock) at this point and gained a whopping 4 lbs of draw weight, bringing it up to 16.5 lbs.
Since I was already invested in making the bow functional (thanks for your votes btw), I ended up cutting new nocks an inch and a half below the ones I'd just cut.
I've now got a pretty normal looking 72" flatbow, but again, the weight only went up by 4 lbs. The bow is now 20.5 lbs, and I'm sure I'll lose a few of those by sanding and shooting in the bow.
Wouldn't be surprised if it ends up at 16 or 17 by the time all is said and done.
Fortunately, my SO is allowing me to use her bright pink arrows to test with the bow, so I'll have a nice lightweight arrow to use.
After a few shots yesterday, I have to say that the draw on this thing is amazingly smooth, and there's zero hand shock.
Of course, it's only pulling 20 lbs, but still, I'm pretty happy with that for my first attempt that went less than ideal.
I'll update this post with a few pictures or videos of it when I get the chance.