Construction cost estimate in Algeria

Hi, I would like to do structural analysis for a precast concrete workshop (Hangar), that will allow me to compare this technique with metallic structure (charpente métallique) .... kind of a feasibility study comparing precast vs. charponte. What I'm thinking is to make the analysis for the same dimensions (12mx42mx8m) and compare the advantages and cost for both methods ( prices in DZD :D). for the precast structure please consider the pre-tensioned method, and for the Roof consider using a hollow-core slab ( pre-tensioned) or waffles slabs taking into consideration the max span possible. Thanks and best regards,