A spherical housing is ideal, because it is very stiff and has no internal reflections. You can use it with GT Power chassis or these 40mm, 4Ohm, 10w chassis from eBay: https://www.ebay.com/itm/123532778305
Sound controller: https://github.com/TheDIYGuy999/Rc_Engine_Sound_ESP32
The author marked this model as their own original creation. Imported from Thingiverse.