CoreModel seems to be some sort of binary data... I am not seeing anything human readable there... To answer your question... there is no ceiling in CapturedRoom. If you want ceiling height, you should look at wall's dimension.y. As for floor height... not sure why you need that... >.< Your standard floor thickness can be googled...

Everything in RoomPlan has Transform. There is no need for alignment since transform has position, rotation, and scale.

That is 4x4 matrix that contains Transform. Transform represents position(x, y, z), rotation(eulerangles x, y, z), scale (x, y, z)

First off, you don't want to mess with ARView... If you are making the view in 3D, do it using Scenekit and manipulating the camera to get the 2D (top-down) view. If you are wanting to provide true blueprint like view, then I would convert the wall dimensions into something simpler representation and present it using SwiftUI. Both are doable and I have done both and combined them into one view with 2d/3d toggle.