Open Core on Fusion Drive

Hi guys, trying to install opencore Monterey on a 2012 MBP.

I created a fusion drive via the terminal.

And installed the base system Yosemite.

However when trying to select the disk to install open core on rather than displaying the fusion drive it contains the SSD and HDD. I selected the SSD but I get an error just after the installation finishes at the "Mac Updater" screen and it fails.

(I've started the process again so I can't give screenshots and forgot the error code)

Is there anything I'm missing? Maybe a step I've missed or something wrong with the fusion drive? It appears as I e drive in the disk utility and everywhere but open core setup application.

Any ideas??