Just to offer another option for you, there is a seller on eBay named "Visual.Ice" who makes custom corner-loaded sub enclosures for the F22. They are based out of the UK so it will take a month or two to fab and ship to to the States. You'll also need to buy your own sub. But for ~$300 it's reasonable for a custom-fitted F22 sub-box solution.
I don't have personal experience with this seller/box but have heard good things from others who have.
https://www.ebay.com/itm/15293991701...Bk9SR9q6j7-5Yg