Round pole raised beds? I don't think i could come up with enough soil to fill the beds with all that pine, but radiatta is a beast so you have to do what you have to do. What kind of equipment are you looking to do the job with? anyone can chop a tree down but how do you move it and how much are you moving. Any use for large logs i've had can't touch the scale your working with. Id say go for hugelkulture but that's an excavator type project to put that much
wood that deep
underground and in controlled amounts, tis no hand job. Do you have anymore details of what resources you have in abundance? I don't care to just spout off at the mouth of what you
should do, if i can suggest something viable based on your details I'd feel like i could be a better help. It's a matter of scale, 100mm i could chop it all down with a brush cutter, 300 mm would take me allot longer with a chainsaw. A dozer laugh's at all of it, but that's not exactly creative, efficient, or dynamic.