[Paul F]

It will cut, but you will need a lot of expensive blades and time with that thickness. Sawzall might work through it quicker, but you have no bend radius. Ralphy's suggestion of drilling and cutting with the angle grinder will be faster. Especially on the outside cuts. Finish grinding the inside diameters with a carbide bit and then sand. A lot of work without a bandsaw or plasma, but it can be done.

If that's not for you, then go to the local machine shop. They can program that into the CNC mill and charge you $150 to cut the shape and inside openings. You'll have a nice clean part. You finish it by drilling the holes.