Just wait until you try to fold it. Tapped horns are hard to do. Front loaded horns are easier, but will take up more space, but will also not necessarily need a high pass, which is mandatory in almost all tapped horns.
Tapped vs front loaded horns are like vented vs band pass boxes. One is easier to do.
If you are willing to put the hours in to learn all the ins and outs (think about 3-10 prototypes), you can get decent at designing bass horns. Otherwise, there are many proven designs (Lilmike, Ricci, jbell at DIYAudio, my old insubnia at AudioKarma, OKWolf's Wolfhorns, BFM).
Lilmike and I have written basic tutorials, and hornresp is now more powerful.
Also, if you have not measured your drivers, do not trust mfg specs and spend hours and hours using them in hornresp.
EDIT - Added OKWolf to that list above...