Bob, I have a Nitto Big Rack that Rivendell sells (sold?) on the rear. It came from a previous 2TT Hillborne I had and may have been purchased about 2011.
The front is outfitted with a small front Nitto Mark's Rack, double-strutted, and a HAR (Hub Area Rack) from Rivendell. Everything lined up OK on my 55cm frame. The front Mark's rack and the HAR are all attached at the mid-fork hourglass braze on at the front of the fork. It took a M5x30mm stainless bolt to penetrate the hourglass brake on fully once I added a small washer.
I don't know how these mid-fork fittings are moved around when the fame size changes, if they do. Here's an album of the bike with racks when I first purchased it (new) and built it up. If you are able to blow up the images it could help you. (At that time, I had single struts for the Mark's rack but later double-strutted it.
If you have any of the other Nitto small front racks with a fixed strut placement, I'm not sure what to tell you. The nice thing about the Marks rack is its versatility in terms of strut / struts adjustability. I think Jan Heine at Rene Herse is making a similar one now - at a higher price. It has an adjustable strut but does not use the diving board though.
If you need additional images, I would do what I can. And thanks for the compliment on the bike. I'm very proud off it.
Paul Germain