Yes - it's a yo yo. With the runners accurately spaced and bolted down, the base slides relatively easily and locks off in 5 places.
The rails require 27mm. Clear cut provide 6mm packers to put in the dips in the floor, I then put 5mm insulation, 12mm ply, 3mm underlay and 7mm laminate.
Will post pics when bed installed but impressed so far!
Unless I'm missing something, the sub base you can see in my pic is not removeable once the rails are bolted down, but the bed frame can be unbolted from the base