Why do you want waist high beds? I don't know your situation, circumstances at all, but the only reason I can think of is that people sometimes make keyhole garden beds that high and keyhole gardens were originally an African design. But I think those keyhole gardens that are that tall are not soil all the way. They are essentially hugelkulture beds with wood at the bottom and soil just on maybe the top half. They are keyhole gardens because the round bed is built around a compost pile which helps feed the garden.
Thirty acres is a medium sized farm. Most of us are gardeners without farming experience. Can you say any more about what crops you want to be growing on them and what you will be doing with them? Selling to a farmers' market?
Personally I agree with what has been said - the only way to have waist high beds is to have them enclosed with some kind of border, box, support. That makes it extremely expensive in materials and labor to build them, especially on such large scale. I am in the process of building boxes to enclose a total of about 350 sq ft of raised bed gardens and personally I think that is pretty close to the limit of what is practical. I will have some other garden beds/patches that will not be boxed in.
But you can do raised, wide row farming without supporting/ boxing in the rows. That would look something like these:
You can use machinery to push the dirt from the walking row to the raised row. That way you have piled all your good topsoil to where you want it, instead of wasting half of it just to walk on. The walking paths will be less muddy/weedy because they don't have all that topsoil and your raised rows will be loose and fluffy. It will be more like a foot high than waist high, but that is quite sufficient for productive gardens. The wide row idea is that you don't plant a single row of crop, you fill in the whole wide row. Very efficient.