Skerry raid kit build. Missing cuts

I’m trying to build a skerry raid, finally after 12 years of dreaming about doing so.

We have all the panels glued, but realized the the notches that were supposed to be cut are not there, and we didn’t get the tool for making gains because the instructions said we didn’t need to.

I’m trying to find out how much was cut out of the rabbits to create these notches so I can cut them out myself as that seems much easier then cutting the gains

Any help would be appreciated

Aloha