1. For the SMBU model, Otomo should instead use the model from NSMBU. No need to port a model from a completely different game, when the base game is already good enough. Also, what's the difference between NSMBU and SMR peach?
2. What do you want that alt to be?
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.