I think at a minimum you use pipe insulation/pool noodles. Depending on how wide, how deep your enclosure is along with how centered the hitting zone is will all determine how big a risk it is for someone to shank a ball into the outer side frame. i have yet to see that happen. For an inexperienced golfer you may wish to make a shank net or foam/pillow/padded board that will deflect/absorb shanks.
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