Paul,
If the layout was not designed to be moved then I would forget about trying to move it. It's an unfortunate reality that very few model railway layouts in a permanent situation can ever be moved successfully and most are scrapped in situ. Sometimes parts of a layout can be saved and that's about as good as it can get since chopping up the baseboards to get them out of the venue usually causes a large amount of damage to the layout as a whole.
The best that can be done is collect and sell all the locomotives and rolling stock and what buildings and other accessories can be removed easily without damage. It might also be possible to lift the track and sell that off as well. You'll need to get a lot of help to do this – especially in five weeks. I would try and contact a local model railway club to get advice and help.
Jim.
Edited By Jim Guthrie on 27/05/2017 09:00:08