I used to be TA of Computer Architecture Class, I know very well MIPS structure.
I did the same project in vhdl but for another ISA structure, I can prepare your project at two days maximum.
Just for information:
I have given several MIPS projects using MARS (java based program) to my students.
Also I have done these MIPS related projects on freelancer.com:
https://www.freelancer.com/jobs/php/simulation-simplified-bit-mips-micro/
https://www.freelancer.com/jobs/CPlusPlus-Programming/MIPS-Disassembler/
https://www.freelancer.com/jobs/C-Programming/Simple-MIPS-Disassembler/
And I got 5 stars for everything for each project.