Originally Posted by Jeff Wills

I'll ditto FB- 2x would be my preference just to get a little more lateral strength. (Interlaced spokes share sideways load where radial tends to concentrate the load on fewer spokes.)

FWIW: what are you using for rims? I'm building front wheels for my recumbents, and I'm having a heck of a time finding decent 20", 28-hole rims (that aren't Sun CR-18).