Why would you go to all that extra work for buildings that are built for their purpose so most of them would be different anyway. The only reason these would be different and that is skids and those are a cookie cutter item. I grew up with buildings on skids and have dealt with them for 40 years. It is common in this area because buildings on skids don't count against property tax where if they have a foundation they do. There are some limits on size too, to qualify.
In general there are 2 width criteria for a building. The first is 8' 6" which is the maximum legal width to move without needing over size load signs and permitting. The second criteria is the maximum width for oversize load without needing follow and lead cars and special permitting which is I think 12 feet(If I am wrong someone correct me on it) Height criteria depends on the trailers you have to move them on and your
local load limits. The skids are most commonly railroad ties but can be steel,
concrete,
wood. Would love to try skids made out of fiber reinforced HDPE recycled plastic. It would be ideal. Never rot, incredibly wear resistant, easy to attach to etc. My favorite of the ones tried is large drill stem. It is so heavy it takes many decades to rust away and is incredibly durable. Big advantage of steel is that it is easy to build in cross bracing to keep the building from racking when towed. If the building has a floor it needs to be well cross braced to prevent racking. If it has a dirt floor normal procedure is to run heavy cross braces diagonally both directions in the building before moving and remove them when it reaches the location. Most common is simply to use railroad ties. After sitting a few decades when moved they often shed a bunch of wood when moved but they work well. If bigger is needed the treated big bridge planks work well. The tow eyes need to be built in on both ends of each skid. In ties or concrete ideally there is a tension rod that runs the full length of the skid and a flat plate at each end to distribute the pressure from it. Normal logs are good for a decade or 2 but usually carpenter
ants or rot mean the skid needs to be replaced every couple of decades to move the building. If it isn't moved they will support the building longer but don't work for skids.(would love to try one of the rot resistant woods like
black locust here) But in this area logs are typically pine, spruce or cottonwood.
Beyond that your skids are determined by your building and your materials. Since small buildings are built for the purpose which is specific to the user and the skids are for the building why would you worry about a bunch of CAD stuff for general purpose?
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