Also remember that Trinity domes have a... lets say proprietary design. If you are off riding for a weekend and for whatever reason need different size domes, or an o-ring set, you can't just buy coolhead, or noss domes, or other similar designs that just aren't as popular. And if you ever build a stroker, or just need a custom profile cut, trinity blanks are $40 a piece, and a shop is going to get you for another 70-80 for machine work. I think you can buy a cut set of domes for a stroker that works w/just about all the other removable dome, aftermarket heads for less than the cost of the blanks.
I would tell Trinity to get bent on the head, and stick to what you asked them to do.
P.S. I run a Trinity head I thought I got a good deal on, I learned the hard way.