Definition of the relievo is that it is a scaled drawing of both interior and exterior architecture, its original design, load-bearing system and also structural materials. The drawing should show structure as it stands. Also it should contain plans, sections and elevations of structure.
1/200 scale is quite enough to express overall things of a building. However for some details, ornaments drawings in a scale 1/50 can be more sufficient.
While doing the measurement we should be sure that surfaces are bowless or not or the corners are perpendicular each other or not etc.