So the Tangband does not fit into the ammo can, too wide, very annoyed, might build it into a tiny combo style amp with a wooden cabinet...
However, I have found some Peerless SDS-135F25CP02-06 drivers I bought for another project years ago, and one of those will physically fit, need to get the driver into Hornresp or bassboxpro to model the driver/box combination and see if it will work. They are recognised as a subwoofer on the datasheet and do 50Hz-5kHz I think.