12x16 gambrel shed plans include the following: alternalte options: the 12x16 gambrel barn shed plans can be built with either factory built doors or you can build the doors using the door plans included with the shed plans. materials list:the 12x16 gambrel barn shed plans come with a complete materials list that is broken down by parts of the shed. 5 foundations: there are 5 different. This step by step diy woodworking project is about 12x16 barn shed plans. the project features instructions for building a large shed with a gambrel roof, that has a significant storage space.. I have designed free plans for you to build a 12x16 gambrel shed. this is a large shed with double front doors, with a side door and two windows. you can easily add a loft to the shed to increase.