Skunkworks returns the model being 31823 for batons, 1 for humans, 306 for longbows, etc... What is the full location of the model in the portal.dat?
0x01000000 + aco.model? so 0x01031823 for batons, 0x01000001 for humans, and 0x01000306 for longbows?

0x01000000 sounds plausible, but it's been a while since I messed with that stuff so I can't say for sure. You could try Googling.

However if those are decimal model numbers you're quoting, you can't just prefix them with 0x01... and expect to get a meaningful hex number. When doing the arithmetic manually, start with hex model numbers.