Wow, this reminds me of the "Windows in Super Mario Maker" hack someone made.
I even showed one of its levels to our user here, and from that point on, he loved touhou. The level I showed off was the Windows 7 level:
Old 3DS XL info:
I used to have a 3DSafe A9LH V11.3.0-36U with Luma in my CTRNAND. Since ReiNAND Reibooted and Re-Reileased, I "switch"ed back.
Right now, I have boot9strap with Luma 8.0 as my CFW. Though, I'd like to see other CFW's for B9S.