I notice a lot of the posters are giving you advice, thinking you have a conventional "cassette hub", instead of the IG hub you have.

Hopefully mrrabbit or FBinNY will be by shortly to give you some "SOUND" advice.

I'm new enough at wheel building to be dangerous, but it seems I've heard that the IG hubs with their large flanges might require a 2 cross instead of 3**********

I would still think your existing wheel could be greatly improved with the use of double butted spokes and PROPER tensioning.