Years ago, had a custom tunnel made by SPI-Nets, out of South Padre Island, Texas. Custom ordered it 10' wide, 10' tall, 20' long, to fit inside our 2-car garage, in the space of a 1-car spot. Hung it from ceiling in about 15-mins. Was not crazy expensive........like $250? They will make any size you want. They used to have a "customizing calculator" on their website so you could plug in the size you want and see what the price will be. Not sure if that's still there?
Here's their website: SPI-Nets
Son got a lot of use out of it. Most extravagant activity was front soft toss, from behind a 4x6 screen, and everything less than that.
The indoors location made it 365-247 accessible. And as it was simply hung from ceiling via eye-screws and black rubber "bungies" with S-hooks on each end, I never needed to do any serious Bobcat work, digging post holes, etc.
Word of CAUTION: make sure you unplug your garage door opener, if you've hung your batting cage net inside the bay. Never happened to me, but would be a CATASTROPHIC event if garage door goes up via motor, and the batting cage net is hanging. Hence I always un-plugged the motor driven opener when netting was in place.