so these guys are on sale, not a bad price. I like the fan idea and it has a dome. a bit spendy for what it is, but if you are serious about it these are what you are looking for. easy enough to reverse and engineer out something. get some foam make your own

https://www.turboklone.com/?fbclid=IwAR3-6MW9UwKtvx_WqMqP3MDiITL2B3xX9iYuXV_mNHafpK0L2QjeUoINHjQ