Tell us about yourself!
HI there.... I live iin a coop apt for 27 yrs this july. Build a shelf with legs... either with inside measurements - use two knives to pry off wood piece. Try not to break off corners. Set aside. Measure pine board , cut, use 2 brackets ,measure and mark with red pencil. Screw brackets to board, insert white short plugs into marks under window. I use this system for my cat OMee to have a window sill perch. Good luck.