I googled a lot of plans online and combined ideas to what would work for me and my tank. One of the best I found had a way to keep bubbles from entering the tank. The bad part was that the inlet and outlet were the same size. I modified it from the pictures to make the outlet larger to reduce the suction effect in the outlet. The outer pipe is 4" and the inlet/outlet were 3/4". Now the outlet is 1 1/2" which has reduced issues. It functioned before with no problems, just would get a big burst if air periodically. There is a Powerhead connected to the inlet that forces water and air bubbles to a pipe inside the 4" pipe which allows bubbles up to the top. The outlet is drilled in the outer pipe which allows the excess water to return to the tank.
Ball valve: $4
Petco Powerhead: $20
Not too bad considering.
When I opened up the outlet more, I bought the 1 1/2" pipe which was $6. So true out of pocket was $66. Had I done it that way initially, I would be right at about $60. Not too shabby considering that the cost of a skimmer this size would be 4x that or more.