The midhorns are avilable as a flat pack kit, or you can build them yourself from the plans. The wooden tweeter horn is available separately, or you can use an Eminence H290.As for the seven π bass bin, it is slightly overdamped which works well for corner loading. You'll definitely get some room gain, so you don't want to overdo it by having an alignment like B4. With the 2226 in a seven π bass bin, you can expect nice clean bass down to 40Hz, with gradual rolloff below that.