Engineering for metal ceiling at a performing arts center.

We have a project with a metal and wood ceiling and we engineering sign-off with a stamp for how the ceiling will hang. The hanging mechanism has been figured out and we have Unistrut in the expanded beams holding the roof deck figured out, but we need analysis of the hanging to determine if it is adequate. Total weight of the ceiling is estimated to be 20,000 pounds over a 3,700 sf room. We need to secure a quote quickly.