Create Structural Engineering Plans for Foundation Walls and Interior Support Beams

I am about to begin construction of a log cabin in the mountains and am in need of structural foundation and support plans. I have the stock foundation plans from the manufacturer, but they were designed for a flat lot and I am on a slope (I can provide topo survery and site plan). The foundation pier locations and interior supports will remain the same, but I need plans for the exterior walls and support. I have all DWG files I can send to work with. I am hoping since I have so much already, this will not be too lengthy of a job, as I need it completed ASAP. Thanks!