Just finished Carmody's Classix 2's and those sound great too! Also, have perused the kits you posted.
Honestly, the Alchemies are not out of any real specific need, but more of a current infatuation with the Eminence woofers paired with the SEOS and Jeff Bagby's take on this pairing. Of all the speakers I have owned, none have provided a sweet spot as seemingly infinite as these have. The tonal quality, stand alone, before they even mix with a room is yet another thing that fascinates me. Sometimes I stand right next to the speaker just to experience that momentarily.
When I used to be into building boats, I would often build models of the hull forms I liked, just to possess that specific shape without going all in. The idea of owning what essentially amounts to a model of the Tempests intrigues me.
Finally, these Tempests keep me up late. I'm having the hardest time turning them off. Going from that to nothingness is difficult to the point of being disappointing. If I have a pair in my bedroom, I can at least set a track to fall asleep by more gradually. And when I have visitors, I have another room to escape to where I can at least close them off from the brunt of my obsession.