We have a cabin that we have converted into a house. On one end of the cabin there are several trees, about 15 feet from the end of the building that we want to top off and leave approximately 10’ tall stumps to use as the supports for the roof of the carport. The other side will be 4X4 posts put in the ground with concrete and attached to the cabin. Will this work? The dimensions of the carport won’t be perfectly square but we are going to make a lean-to type roof so there won’t be any trusses