@mopardude318
I built a similar building (we call it the barn because we already have a garage). It’s 20x 30 with a 10 foot side shed on it. It has 12 foot high side walls. I built the barn doors myself, using two Unistrut tracks with rollers at the top and rubber wheels on the bottom of each door. The weight of the doors is carried by the rollers on the bottom.