For the first question, I understand "Mexican indigenous eco-tourism projects" to mean eco-tourism projects based on (or are about) indigenous Mexican culture. If that's what you meant, then it's fine. The second and third -- adding variations of productive -- is a little confusing. Do you mean that the projects *involve* the participation of indigenous Mexicans in the implementation of the project (like having them be local guides in tours) and are not *just* about them (which is what the first sentence implies)? If that's the case, then you could say something along the lines of "Indigenous Mexican eco-tourism projects" (the capitalization of Indigineous Mexican indicates that it is a particular group). But to be really clear, it's better to expound on the idea, such as: "eco-tourism collaborative projects with indigenous Mexicans" or "eco-tourism projects that cultivates production by indigenous Mexicans" (if they're creating a product).