It seems you are looking for a titled "Análisis de Precios Unitarios BIMSA" and are asking if it is a "good piece" (likely meaning a useful or high-quality resource).
Here is what you need to know to find and evaluate that document: analisis de precios unitarios bimsa pdf
If you need a sample or template of a high-quality Mexican APU (not BIMSA-specific), I can provide a structured example in text format. Would that help? It seems you are looking for a titled
However, I cannot directly provide or attach PDF files. I also do not have live access to BIMSA's proprietary internal databases or their latest price analysis documents. analisis de precios unitarios bimsa pdf