Gigantex make many rims This one comes with a warning from the distributor to lace radially on the NDS rear. the front should also be laced radially. Maybe it is down to the way the holes are drilled. Either way that is how I am doing this.
Well, it sounds like this is all pretty well thought-out
It is odd to me that a rim mfr would require radial, since I would imagine the hub (and bracing angles, etc.) would play a larger part in that sort of decision. But I'm sure they have a reason.
Take BHS hubs out in an english winter with salt on the road and you will see how good the bearings are. Enduro are not one of the worlds top bearing makers by a long way.
I have ridden them through a few mid-Atlantic (USA) winters without any problems. But we get less rain than you, I assume. So, they have worked great for me, but understood that in more extreme conditions they might not. I suppose I should count myself lucky I won't be experiencing that first-hand
Also when did hub weight actually contribute real world wheel performance. I am building a aero race wheel for racing mostly adding a 100g or so on the rear hub will not slow me down.
You do realize this is weight weenies, right?
... And it makes this quote sound a little contradictory:
... it is a race wheel so every little advantage.
Anyway, good luck on the build. Sounds like a fun project.