That part will be pretty difficult to make with any accuracy if your school's equipment is as poorly maintained as mine! You should try to make a little one, not to scale, just to learn the process and see how it goes.
We make most of our hole patterns using a small rotary table on just a table top mill and you can get pretty good, but it takes practice!
I have used
MFG Quote before with reasonable success.
You can select qty, material quality, etc and then upload your design drawings and company's will place bids and then you can award the part. Most companies will even take "make to model" also if you have Inventor/ProE or any models typically that you can convert to .iges or .step. You can get a huge range of prices, but you have to look at the manufacturer very closely!