How to build a garden arbor. below are 15 free arbor building plans. these diy arbor projects are simple to build, most of these include a material list. the arbor can be easily customized to build your own style. the websites below will show you how to build an arbor, give you tips, and plenty of ideas so you can easily complete this project.. Easy to build arbor, free plans, simple design. complete easy to follow instructions to build a garden arbor. free plans for outdoor projects.. The first step of the project build the sides of the garden arbor. as you can see in the image, you need to place two pieces of 2