Bear in mind that Tarahumaras are a dwarf locality. I have babies that were born 8/1/19 and they would still be comfortable in a hatchling rack, though I moved them up to 16-qt tubs so I could consolidate them in a rack with some other critters and turn off the hatchling rack. I expect that will last them another year, easily. My adults are in 41-qt tubs and the male could easily downsize to a 32-qt if needed.
Just like any other boa they should not be fed heavily; you want them to get up to adult size at 3-4 years old.