I'm not quite sure I understand your question, but I'll try to explain how I have installed my 2-chainring setup on XTR...
I bought to TA-chainrings:
One for the small position with 28 tooth. This is a speciel one, because 28 tooth is not usual for the small position - But TA makes them.
One for the middle position with 42 tooth. This is also a specielt one, because 42 tooth also is not normal for middle position - But again, TA makes them.
You don't install a chainring for the upper position.
Then you need to space the small chainring away from the middle position. This has to be done because a normal XTR chainring has inbuild these spacers. 1 mm spacers will be enough - buy them in a tool-shop.
You also need speciel bolts for the chainrings. You can buy short or long bolts. Eighter can do the job - you need one part of both
I went to the local dealer, and bought the bolt from four geardrops - these works just fine.
Now you just put it all together
Does this explain enough? What I can do is, that I can take some picture and mail them to you, but first about thursday or friday.
Another thing. When I got the frame, there came a small spacer of plastic along. This has to be installed in the "drive-side" on the XTR-garniture. Are you using this?