JBL 4344 MK 2 volume of 2123 internal enclosure

Hi,I would like to build a 4344 clone. As I have 2123 middriver I wonder which would be the right size of internal enclosure and how to stuff it.
Clone will be more like 4344 Mk 1, only the middriver will be 2123. I will use digital crossover + lm3886 amps.

best regards
mike