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Jesus.
Yes to the board in an acro around it and run though.
Have a mate who really knows what he is doing, but does go through a decent supply of props. I think it's more free forgets to pick them up from job after he's finished than that they get left inside a wall. But can totally see it happening.If we every get the chance would totally build our own from new, either wholey or prefab a passivhaus job with a nice view. Land cost aside they really don't cost as much as I thought. Esp when a smaller, less efficient, potential for instant negative equity, and attached, and also not built well, "bellway" "home" is getting on for £350/400k. Proper sick of finding other people's trash jobs in houses.
We had a beam not dissimilar to that, it was supported by absolutely fuck all. Make sure you see the ends of yours before you make any assumptions.