Is there anything unique about installing a Fenrir Duo to this model 1 Japanese Saturn?

I’m new to the Saturn, and I just picked up a Japanese model 1 system. I’m currently waiting for a Fenrir Duo to ship to me, but I opened the system up to take a look and it seems to be built differently to the models in all of the video tutorials I’ve watched. The PSU is attached to the lid (see picture). I’m just curious if there is anything I need to be aware of when I install the Fenrir in regard to these connections. Thanks in advance and happy holidays!

I’m new to the Saturn, and I just picked up a Japanese model 1 system. I’m currently waiting for a Fenrir Duo to ship to me, but I opened the system up to take a look and it seems to be built differently to the models in all of the video tutorials I’ve watched. The PSU is attached to the lid (see picture). I’m just curious if there is anything I need to be aware of when I install the Fenrir in regard to these connections. Thanks in advance and happy holidays!