I'm just glad somebody knows what i mean, it's clearly very hard to prove and i understand because of this you couldn't believe but it's possible isn't it? you could imagine split logs in the v's and strange angles of portal tombs, it would be a lid on the chamber below the main stone capstone, it would also explain why not a lot is found in them, because once the woods rotted away it would be quite exposed under the stone capstone even if the big stone capstone did stay where it was intended, hopefully in the future they'll make a machine that will show where wood and stone once was in the past.