Working with off angles bodies

I’m trying to build a tetrahedral assembly and to model the finger joinery I need to cut the component via a boolean subtraction. Trying to align the group of cutting objects that are oriented at 30 degrees by 25.7 degrees along the edges of the panels is a grand nuisance as I cannot manage to set the gumboil for the group and keep it set.

Shared with CloudApp (1.2 MB)

you will want to create and save some custom construction planes for this.

setting a plane to object is a good place to start.