Metal Building/ Garage…

Why not stick build the four walls and use engineered trusses. A local lumber yard can source the metal siding and needed fasteners and trims. Make sure you insulate and ridge vent and soffit for breathing. That building is small and manufacture possibly has a perlin going right across that face probably at tue 10’ mark. That is needed cross support for cut down on wind shear loads tweaking the building. Order the building if you cannot stick build for 3 sides and roof. And then stick build front. 2x6 wall and do a 12’tall x 10’ wide door and 2 windows. IMHO. I’ve built a few of these buildings and they are always smaller than you think when done.