This is not a copy+paste proposal:
Hello. I read your project description and I would be interested in the job as the person to communicate, explain the project and request offers from production companies in Mexico.
I am Venezuelan, currently living in Spain, and I have worked with Mexican companies in the past. I have a degree in Industrial Engineering, so I consider myself very capable of doing the tasks you require.
However, I can not be available for the full day time this week, because I have another job to perform.
Nevertheless, I believe you could still give me all the information and guidelines, and I could contact the companies in a very efficient way.