This is the cabin layout for the Citation CJ4 as included with MSFS and improved by WorkingTitle. It is based on the rather standard 6+1 seat layout of the CJ4.
Find details on the CJ4 interior here: https://cessna.txtav.com/en/citation/cj4-gen2#_model-interior

I tried to faithfully recreate that for SLC.

To install, all you need to do is drag and drop the Citation CJ4 folder into your Self Loading Cargo\Cabin Layouts folder. You can then select the layout in SLC as usual.