As head developer for my current employer, I work with multiple languages each day (C++, C#, VB6, and some VB.NET). I also was solely responsible for porting the old flagship product from a 16-bit IDE to C++ and have written numerous components in C++, C#, and VB. I feel that by utilizing my multi-language background, I can carry out this project in a manner which will yield robust, easily maintainable code.
As a side note, the approximate delivery date reflects a lack of knowledge of the code's present state (readability) and a basic estimate of the total number of code lines given the figures in the posting.