Probably a bit easier than what Peter did. Ribbing aside it is very easy to forget that bars provide a really easy way to offset things and reverse studs. They're not useful for all situations but they're a handy piece to keep in mind when doing SNOT.
A facade technique for corners. The important part is this, which may be hard to source. The offset is a half-plate on each side of the dark bley block. I would love to see a solution that is solid and only uses in-production parts.: