Concrete Slab OVER Stumps...

Before you scream "Don't do it!", please read on. I am considering pouring a 40'x40' concrete slab, possibly up to 40'x100' depending on a lot of circumstances, well all circumstances basically boil down to cost. I will need to clear the land first which consists of wall to wall Ashe Juniper trees, also known as Mountain Cedar, Rock Cedar, Post Cedar, Mexican Juniper, Break Cedar, Texas Cedar, Sabino but is usually wrongly referred to as just Cedar. The tree is well known for being rot resistant and most commonly used as fence posts lasting up to 100 years or more. I cut several dozen or so down a few years ago ranging from 3" up to 18" diameter at varying heights, some flush with ground and left some a foot or so high. All of the stumps show no signs of rot and are much drier and harder now than when cut. I have no idea the condition of the roots but assume they are in good shape as well, when you kick a stump, it doesn't budge.

Considering the rot resistance of these "Cedar" trees, do you think it would still be a bad idea to pour a 4" concrete slab over stumps cut flush with the ground? I am estimating around 50-100 trees of all shapes and sizes that would first be cut flush with the ground, left to dry in the sun for a few months or longer, covered with a couple inches of compacted sand, vapor barrier and then concrete. If this turns out to be a unanimously bad idea, I will switch gears into post and beam planning. Pulling all of these stumps out of the ground is either too much work or too expensive. Thoughts?

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Concrete Slab OVER Stumps...