I took the hubs and rims down to the wheelbuilder and had a quick chat.

The front is easy - 3x with a double butted DT Swiss spoke.

For the rear I made the suggestion of 4x on the drive side and he had a think, then nodded that it seemed to be a good idea because the hub was so heavy. Possibly would be a good idea to go 4x both sides (ie not a lot of dish on the IGH compared to a cassette hub).

He has to email the quote to me later, so he was going to have another think about the rear lacing and get back to me.