Thanks everyone for your kind comments.
There'll be no druids around on the Solstice and I'll be 4 hours behind Salisbury Plain's sunrise, but I could at least take the model outside and align it for a chuckle or two.
The model's base wasn't wide enough to include the bank, ditch and outlying stones, so there's no Heel Stone to get everything just tickedy-boo.
Bish, I don't know how recently you've been there, but my research shows that the A306 road, visitor parking lot, and tunnel have been removed and grassed over, giving the site a better appearance.