You could load the world in 1.7.10, I loaded the world myself and all of the newer blocks were removed as expected. You can get the idea of what stuff is, all the brick buildings will have no roofs, the cranes look a little weird, almost all of the train cars and engines are gone, and all of the vehicles look weird and destroyed. Iron trap doors are also removed and this build uses a lot of those so it will look strange because there will just be door ways leading to no where and door ways just hovering around, and a lot of the detail is gone. But I would say its doable, just not recommended

Yes I believe so