bladup wrote:
The sidestones look the wrong way around on a lot of portal tombs because they had something [maybe wood] against them [and on them], therefore sealing the chambers, you see it again and the main capstones didn't seal the chambers on loads, it explains something in the design of loads that hasn't been explained, the trouble is i know what i mean but am shit at explaining it very well -one more try- the strange angle of the side stones is the hold something and seal the chamber, it's a very simple design, i hope you know what i mean [they were probably made of wood].
I think I know what your getting at .Yes sidestones can be found at steeper slopes and the same angle as the capstone and also in the opposite direction and even together (creating a shallow V ) . You get examples where there is nothing at all and that has been confirmed by excation e.g.one side of Pentre Ifan .The question is ,is anything missing ? Possibly corbelling or wood as you suggest ,allowing for the cairn to be higher without causing ingress but there must remain the possibility that is the way it was meant to be .Another common feature is that the sidestones do not meet the capstone at all and have smaller angular "windows" and gaps I doubt that they were filled with pad stones which are found in relation to back stones and doorstones but not sidestones afaik. 