Hmm...a tree for the center mast. It is non-conductive (that is good) ... the spacing is more than necessary, but wouldn't be a problem if it was modeled. The biggest problem would be keeping the loops the same size and shape...very critical, especially at low frequencies.
Is the supplied wire insulated?
I'm thinking in terms of my 60' tall Pin Oak trees which have bare vertical trunks that go up about 30 feet to where the tree branches out. Trees aren't exactly non-conductive. In fact they have been used by themselves as verticals. Military did a lot of tests on that long ago. Drive a nail into the base of a 100 foot tree and you're on the air in 5 minutes!
I don't foresee problems (at my QTH) making the loops even. A few minutes with a tree saw will take care of that. What about the loop bottoms? My yard, like many, isn't perfectly flat.
Thoughts on grass mowing and critters... real world problems that a lot of buyers will wonder about?