Before you cut a single piece of wood, you can view predicted frequency response curves, phase response, impedance, and delay.
Beyond the physics of sound, the software helps with the "how-to." It calculates external dimensions based on your desired internal volume and account for the displacement of the driver and bracing. Why Precision Matters in Bass Design
Mastering Subwoofer Design: A Deep Dive into BassBox Pro 6.0.2