Are you planning to re-use the old spokes with a new hub? That is generally ill advised- spokes are under constant loading and unloading cycles and can wear out. If you are building a wheel with a new hub, it makes sense to use new spokes. and a new rim for that matter. Hubs- especially old sturmey hubs- last forever with very little maintenance.
what's the background and reasoning for a new hub without using new spokes and/or rim?