The reason I brought up the 2x limit is because when I bought my last bike the guy at the LBS built me a set of wheels to go with it (they didn't have the complete build for my bike in stock). He laced some 585 rims to Dt Swiss hubs but built the rear wheel with spokes radially laced on the non-drive side and a 2x lacing on the drive side. I thought doing it that way would be fine for the Powertap until I read the Cycleops manual for the hub.
Of course I've been having problems with that rear wheel for months now which leads me to believe that the guy who built it might not be the best wheel builder...
With 24 spokes you are going to need at least 130 to 140 kg of DS tension for this build.
I have a DT Swiss rim specs sheet which states that the max tension is 1200N. I realize that with less spokes you need more tension, but how do you know how much tension to go with? And is it wise to go above the max # provided by the manufacturer?