dual opposing 8 inch

Thank you all for this discussion thread. It is a treasure trove for new generations getting into it.
Like @satx I'm trying to build a small compact dual opposing subwoofer.
I'm thinking either the 7" epique or the 8" ultimax.
Do you have any advice or recommendations for me on driver selection, box builds or plate vs power amp selection for the same?
Still drafting my plan for it but wanted to get the drivers before Christmas sales end 🙂
Thanks in advance!
And wishing you all a festive holiday season.