Hi there,
I offer my services for this project, as a graduated Civil engineer with structural and geothecnic degree, most of my courses demand me to use matlab and other kinds of math programing, in that sence my experience with the program is pretty extense.
In the particular case of your project, the solar problem and incidence of rays is something I´ve seen before, so I acan guarantee you I will not have any problem delivering the project on time, and with very good results. The price is a little higher than the budget you posted, becuase I like to be realistic.
Hope we can work together.
Good luck.