Small barns small barn plans horse barn decor horse barn designs horse shed horse barn plans barn stalls horse stalls dream stables forward three stalls with excellent function and design.great barn to put in the pasture and let the horses run through the runs to their stall.. 2-stall barn with storage (1200 sq ft) free barn plans & floor plans. this sample plan is for a small horse barn measuring 30? x 40? comprising of two 14? x 14? horse stalls a 14? x 12? storage area and a 16? x 40? aisle.. This step by step diy project is about 10