Funnily enough, I'm considering a TE Elf as a backup amp.
The logical next step is a decent, compact 10" cab or a 2x8" or even 1x8" for practice and maybe things like backing acoustic folk, but capable of coping with the 120W of the Elf (into 8 ohms).
The TE 2x8 is pointless - it weighs as much as my 2x12. And teh 1x10 is expensive enough to make a home build appealing - I like making such things.
So I, too, tried finding an EASY 10" CAB BUILD thread this morning.
Haven't got further than browsing Eminence and Beyma drivers.