Buy the hubs online - either on-one if they're still cheap or where ever else you can find systemX hubs.
Rims wherever online where ever is cheapest. Other options are:
KinLin ADH from hubjub c.£30 each; or
Rigida from SJS or that other shop with green logos.
Velocity Dyad (although they have a low profile V-shape rather than box-like)
ACI Spokes from cyclebasket
Buy the hubs online - either on-one if they're still cheap or where ever else you can find systemX hubs.
Rims wherever online where ever is cheapest. Other options are:
KinLin ADH from hubjub c.£30 each; or
Rigida from SJS or that other shop with green logos.
Velocity Dyad (although they have a low profile V-shape rather than box-like)
ACI Spokes from cyclebasket
PM Arup on here to ask about building.
Other options are looking at Halo.