After the Sheetrock in garage took a beating from trying to use a bownet, I just attached a cable to ceiling using eye bolts and turn buckle. Then used snap shackles to attach a net so it would slide to side if I needed room in garage. Got a cheap rug that hangs behind net on same cable to hit into to deaden ball so net weight isn't needed (first one I bought was too heavy and balls rebounded off of it, so FYI use a light weight rug). Bought net long enough to have extra on the bottom to fold up and make a pocket for balls to drop into so they don't bounce all over garage after hitting concrete floor. Ran another cable on beam in front and left extra net on top to make a ceiling for cage and wrapped net 2' on sides to make walls. Got light gauge net for about $40 (14'x10') from networldbaseball. All totaled approx $60 plus about an hour to construct. Not sure what clearance requirements you are meaning, but this set up worked well for us.
Nice...Recognize two horizontal parallel red lines... lookz higher than the ones I use... whats your formula ?
Any pics I'm wanting to do the same thing in our garage. We currently use Bownet in garage with foam jugs balls. Not bad but would like to hit real softballs as well.
There a few pics posted on the previous page