Rob our electrician has been patiently drilling away into our SIPs panels - this is one of the numerous challenges that brings into question the efficiency of the SIPs process. Even with the pre-cut chases, at every corner and from wall to ceiling, in many cases Rob has had to cut out access holes to get at and pull the wires.
We had more visitors at the site on Friday (from two great local architecture firms Studiotrope and Insitu), and they spoke of a SIPs process where electrical conduit and boxes are installed as part of the fabrication process vs. in the field. I guess if you can coordinate everything down to the last 1/2”, it would be advantageous to do it this way.
If you are building with SIPs, make sure your installers place the panels at the intended interior/exterior orientation, and that each corner is drilled out for continuous chase access. Also, make sure each chase is well marked. We had a few panels that are square and symmetrical which were installed backwards - an easy mistake to make, but it has created confusion when trying to pull wires, because the chase marks are no longer visible.