You say this is a Campy FW hub. Have you re-spaced it to remove most of the dish? If you are going to rebuild this, why not get a fix gear hub and 1) get a hub with very wide flanges, almost the same as a front with very little dish and 2) has provision for a lock ring.

True fix gear hubs make up wheels that are a joy to own. Those wide flanges with almost no dish (none if it is a flip-flop) make for very strong reliable wheels. Wheels that are a big step up from any FW or cassette wheel. I lace them like you, with 2.0-1.6-2.0 spokes (same but 1.8 on my city fix gear), 32 spoke 3X.

Ben