Glad you liked it Mark sir!
It really is a biggie; now again, no proof inherent, but Cheryl Straffon from Meyn Mamvro informs me it aligns directly SW to Carmenellis Hill; this alignment further extruded just misses the settlement at Calvadnack (but hits a long straight field wall a short distance away) and ends at up at Burras menhir on the other side of the hill, which in its turn has a NE (Midsummer solstice sunrise) alignment to Carnmenellis. "So Carvannel stone does seem nicely placed in the ancient landscape."
More grist to the mill at least...?