price for an investment project

Hi

I have been asked to direct an investment study here in Uruguay, including the technology study. The idea is setting up a large soy oil facility. In the past I have charged 1% of the total investment but I don't know which is the trend right now. Also, as this is going to be such a hard work, I want to ask for an advance payment, a guarantee deposit. How much would be appropriate to ask?

Thanks in advance.

Gustavo