Already have four of ss18w8531 looking for project

Now I have SS 8531 in 2way bass reflex floor standing 2 pair.

I want to upgrade my speaker performance that can use all of my 8531 driver.

I have three project in my mind.

1. MTM like Seas Thor kit look interest.(Can I change woffer to Scan 8531 without changing the cabinet plan?)
THOR


2. 3way like Ekta grande
Ekta-Grande


3. 2.5way like ZRT
Zaph|Audio - ZRT - Revelator Tower


Which one are better.
or any suggest welcome.





sorry for my bad in english.