Picking different drivers means likely design changes.
Below are T&S parameters you should look for if you want a substitute. Additionally I've included a few screenshots around the box tuning. This is a bit of an unusual design and this is a DIY forum so DIY as you wish! I haven't found anything that does loud, sound quality, and long battery life as well as the boominator.
I'll try to find the Boominator digest I created some time ago and upload it for reference. I created it because this thread is HUGE and it's hard to find useful information.
Drivers that were used in the past for each Boominator 'version'
Hey mind DM'ing me? Just created the account so I can't start a DM. I am interested in knowing prices. I am not sure if I want to build the full Boominator or the MINI but it will probably depend on driver costs.