Stuffing pillows, blankets and mattresses in a drum is what makes it sound like a box.
Agreed, guaranteed to work every time
Perhaps you are confused.
Nope
I listened to it and the bass drum sounds just like you'd expect from such an outrageous design: Outrageously thunderous.
No, I'm listening through my reference cans right now. They don't lie. Even taking into account the crappy recording, it's not outrageously thunderous, it's outrageously consumed by boxy overtones, outrageously thin, outrageously woofy. It's producing zero bottom end. The floor tom is producing more bass than the bass drum, & that can't be right. It's quite loud, but other than that, possibly one of the worst bass drums I've ever heard, & all this against a background of me being a fan of deep shell drums.
I can imagine the "design" discussion. "I know, let's use the deepest shell we can physically buy from Keller, & that will guarantee the deepest possible sounding drum". Wrong = epic fail. A classic case of believing the "deeper is deeper" hype, then taking it to the extreme.
I like anything that's a bit of fun, & in that regard, it's a huge success, because it's a joke!
Your deep drums however, are magnificent. They were built by someone who knows what they're doing, & it shows, just as much as these were built by someone who just took the customer's coin.