Eddie, be careful of how you build your rake. Of course it makes a big difference what your pulling it with. If you are going to be using a little bigger tractor, I suggest that you build it heavy duty. Especially when you will be using it a lot of the time.
I bought a Midwest 8' rake myself and proceeded to twist and bend the channel iron that it was made of into a pretzel.
So I rebuilt it with some heavier metal. I got new channel to hold the tines and welded that to a 4"x7"x 3/8" wall tube. I have had no bending since the rebuild.
Here's a picture of it just after I was done with it, and I had the whole thing powder-coated.
Brian