Volunteers needed to fix a leaking roof for Andrés in Oaxaca de Juárez

I'm a night-shift nurse living in Oaxaca de Juárez. During the last storm water started coming through the ceiling in 2 places, and the living room is no longer usable. A roofer quoted $1,150, which isn't something I can pay. The good news: a local hardware store has donated the shingles and underlay. What I don't have is people to do the work. I'm looking for 4-6 people who can help over one long weekend. Experience helps, but it isn't essential - I'll have a licensed roofer supervising for safety. All you need is to be comfortable with heights or willing to help from the ground. I'll provide lunch, water and lots of thanks. The work will be done on the ground and roof with proper harnesses. If you can only help for a few hours, that's welcome too. Even a small gift gets used right away and I'll thank you myself.