I agree with Andrew's comment. Your professor may be looking for something very well developed/discussed in theory and may not give you credit for the "build". We are all resource constrained (time, money, knowledge) and the effort put toward build is likely to take away from the main assignment. That is not to say you should give up entirely - but maybe show your advisor a little more of what you have in mind.
I recently provided some assistance to an electrical engineering student in his senior project. His mission was to design and build an amplifier. His professor was looking for a well developed design and also a very strong understanding of the concepts behind taking a design from concept thru to production (even if only a quantity of one). That was the whole mission as agree to from the start and he did well on it. The important point here is that he invested resources in a way that met the criteria - and he spent time up front with his advisor making sure of the goal or goals.
Please do not mistake anything I've said here as criticism of an effort to do much more than expected. I/we are only warning you that the task may be larger than you anticipate and/or some of your effort may be ignored as it was outside the course requirements.