Here is the Nimble Website:
Welcome to Nimble
Nimble Fly, Carbon Rim
Carbon Tubular Rim: 340g
Front Hub: 68g
Rear Hub (Road?): 240g
Front (16 spokes): 490g
Rear (24 spokes): 735g
Total: 1225g
Nimble Spider, Aluminum Rim
Clincher Rim: 370g
Front Hub: 65g
Rear Hub (Road?): 220g
Front (16 spokes): 531g
Rear (24 spokes): 734g
Total: 1265g
Nimble Crosswind, Trispoke
Front Hub: 78g
Rear Hub (Road): 218g
Rear Hub (Track): 178
Front (Trispoke, Tubular): 693g
Rear (Trispoke, Road): 833g
Rear (Trispoke, Track): 793g
Total Road: 1526g
Total Track: 1486g
I think the skewers are extra, Front: 32g Ti Rear: 34.8g Ti (nuts for rear track, 30g)
Note, there are quite a few very light tubular tires, so say you can get a 200g tire, or so, that may be a substantial weight savings (simpler rims, no extra tube).
Of course, tubeless may be rapidly approaching the benefits of the tubular.
They don't seem to be listing track hubs for the Fly/Spider, although they may be an option. I think it is a fairly small US company, and you can always ask.
I'm not sure why the fly hubs are listed as heavier than the spider hubs.