MarkAudio Alpair 11 MS gen 2 In Sibelius Enclosure?

Hey all - I recently had the opportunity to hear the Pearl Acoustics Sibelius and decided I wanted to build some speakers based on the cloned designs I've seen here on the site. I have decent woodworking skills, and started right in with building the cabinets - and then realized it was going to be a bit more difficult to get the 10.3 drivers than I thought. I have a pair of Alpair 11 MS gen 2 drivers on hand, and am looking for some thoughts or recommendations. I'm not an expert when it comes to the engineering or physics, but I know there are designs very specific to the Mark Audio drivers. I was curious if it's even worth attempting to put the 11 MS into the Sibelius enclosures I've been working on, or if there are obvious reason's it's not even worth giving it a try and just try to find the 10.3. If not, I plan to just stick with one of the tried and true designs I've seen here (Pensil, Sea Stack, Water Buffalo). Would also love any general opinions about the difference in sound between those 3 designs.

Thanks in advance for any thoughts or info!
 
Pretty sure a Sibelius would need a re-design for the 11MS. I have no data to back this up thou, and no way at present to model a TL style enclosure. Just looking at the TS values and a comparo in Winisd.

I thought the Sea Stack with 11MS was great. That's the only enclosure I've heard with the 11MS. I'd be very tempted to try them in FHXL boxes.

jeff