FWIW, Melissa at DTA said they had extensions ready for if/when I wanted to rebarrel to a different cambering (that is not offered). IIRC Nick said that any smith should be able to add a barrel (of any manufacture) to the extension (which is the only sensitive part of the barrel contour according to Nick...the owner/designer). I think Krieger will be my choice bbl, have yet to decide upon the chambering, but I have plenty of time to think about it while I am wearing this one out.
Lets move further discussion to...
here...the rifle arrived today.