Hi, Tom Kyler here, new builder. I too am performing a 3D 'virtual build' to help understand the plans and construction. For those interested and software saavy, an alternative to Solidworks is Blender 3D, which is free and a relatively small download. The learning curve is still required as would be expected with any new software, but I believe it is no more complex than Solidworks (which I use in my engineering day job). Blender is NOT a CAD software, but rather a generic 3D/animation software...no history based or parametric modeling, but its ridiculously quick to build geometry for "what if" scenarios. The following work I did in about 2 hours. Note that I do use a CAD package (Vectorworks) to develop the design dimensionally from the plans...but then I use the CAD reference dimensions as inputs to Blender 3D.