I attempted an illustrated reconstruction of the British Neolithic Long Barrow Skull:

[Barreldriver]

Critiques and any suggested corrections are more than welcome:

http://i326.photobucket.com/albums/k438/ragnarok1227/troefig14.jpg

http://i326.photobucket.com/albums/k438/ragnarok1227/reconstructionoflongbarrowBritishsk.jpg

http://i326.photobucket.com/albums/k438/ragnarok1227/reconstructionoflongbarrowBritis-1.jpg

[Piparskeggr]

As for me, that is a nice rendering.

[Psychonaut]

Nice work! It looks like a reduced Cromagnid skull to me. Compare with an Alpinid:

http://www.theapricity.com/forum/attachment.php?attachmentid=2496&stc=1&d=1251161993

Although, the Long Barrow skull is a bit more dolichocephalic and has a less prominent chin. I would venture a guess that it's a Borreby skull.

[Barreldriver]

Found some errors in my OP, I did not account fully for the thickness of flesh, I am working on new versions. I'll post tomorrow.

[Barreldriver]

Hopefully this is an improvement on my OP:

http://i326.photobucket.com/albums/k438/ragnarok1227/reconstructionoflongbarrowBritis-3.jpg

http://i326.photobucket.com/albums/k438/ragnarok1227/reconstructionoflongbarrowBritis-2.jpg