what i will say like I've said in other threads what seems impossible in one species can be straightforward in another. in this case wet oak and kiln dried oak are like chalk and cheese.(more like potato and iron) . it really wouldn't have been less doable just slower with handtools. obviously this is fairly small and being done without assistance but scaling stuff up is just more help. what would have been technically more difficult is all the trees would likely be roughly squared and not at all regular. I feel that's what makes old frames look "crafted" my beams were sawn by a chap who backs his tractor up to the sawmill, connects the pto and saws using a huge circular saw(from Atkinson walker) if I ask for 6 inch thats what I get.