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Yeah exactly.
I want aero. But low spoke dynamo hubs in 15mm thru and centre lock don't exist.
Hence wondering if I could build a 36h hub to 18h rim.
skinny-
low spoke dynamo hubs in 15mm thru and centre lock don't exist.
There's a reason for that :-)
If you persist with the 36 into 18 project, build it 12:6 with the 12 spokes on the disc side, that's the lowest number I've seen being tasked with transmitting brake torque to the rim. Since the angles of the spokes will be slightly different between pushing and pulling, arrange it so that the pulling spokes (when braking) are the more tangential.
gbj_tester
Do you want aero or "aero"? As @danstuff says, there are plenty of deep crabon fribé rims which can be had in 32/36H, but if you were really concerned about your aeros you wouldn't be using that many spokes, because the spokes generate a large proportion of the wheel drag. Half the benefit of deep rims is that they let you use fewer and shorter spokes, what the rim itself contributes to the airflow is in the area of marginal gains.