Greenhouse Covering Installation

I need someone to cover an existing 30' x 96' greenhouse with 25-year HDPE fabric. The fabric should have standard UV protection.

Also, I would like to support the center with a microlaminated pressure-treated beam of the lowest cost option (Douglas Fir, Southern Pine, or Spruce-Pine-Fir).

Ideal skills and experience:
- Experience with greenhouse construction and covering
- Knowledge of HDPE fabric installation
- Ability to work with pressure-treated beams
- Basic carpentry skills

Please provide a detailed quote including labor and materials.