The original idea of boring the cases would have worked, but using the boring head in that position would have meant we couldn’t see inside the bore. Blind operations are ok, but I prefer to be able to see what’s going on. It’s fair to say that your ears tell you a lot, but even so it’s good to have eyes on what you’re doing!
We looked at making an adapter plate to swing a vertical head through 90 degrees. (Sideways, so to speak!). When we dug out an old vertical head from under the bench, it turns out it’s adjustable anyway 😁 So with a bit of fiddling to get it parallel to the table, the boring operation is all worked out.