New here, with a baby bp, few nervous questions.

[Skittles1101]

Actually, an enclosure in which the length is 1.5-2 times the BP's length would be way too large.
If you do end up switching to a tub (which I highly recommend), a 28qt should be fine for your size Ball Python. An adult male and smaller female ball pythons can be housed in 32qt tubs. Females larger than 1500g can be housed in 41qt tubs.

I've kept all of mine in 34 qt at some point (my quarantine rack). Even my small 105 gram female did fine in it as long as she had her two hides. Although the 28 qt may be better for smaller ball pythons.