I made a 12s3p 21700 in one of these. I think @Evwan also made one or two packs in one of these but I may be misremembering.
Depending on gear drive size and truck mounting you might get away with inward mounting.
The other deck this enclosure fits really well is the zenit marble 38.
There’s was a group but some years back. Should be more space and mounting options on this.