Have you found someone that is willing to build them? I know that
@Coolerman will refurbish them, but there are a few proprietary connectors that can not be found new (ex. hazard switch connector).
The pictured harness really doesn't look bad - not much has been hacked off or spliced in. My advice would be to rebuild the one you have. Unwrap it, clean the wires off, check resistance, look for damaged insulation, replace bad wires and connectors, and wrap it back up in harness tape and maybe add some wire loom. If needed, a lot of the connectors and terminals can be bought from
corsa-technic.com.