Mike,
I bought the hub with the same intentions. When I slid my blades in the holes did not line up. Close but no match.
Evidently, they drill the blades and the hub at the same time giving you a matched set. I thought of several ways to make the holes line up, but after doing this will they be balanced?
Ron's idea with the Fleck blades has been done successfully. I personally, would like to send the hub to the new Mc people and have a 29 or 30 foot set of blades made.
When I bought it, I was hoping the holes would line up and I would have half the battle won. I'm building a KB-2 with Subaru and plan to use my 23 foot Skywheels. I might need to extend them to 25's. I do not want to modify the holes in the blades, just the holes in the hub. So, I can still use my 3 foot hub.
If I decide to sell it, and you are up for the challenge, I will let you know.
Thanks for your interest.