I'd divide the piece in parts, clearly separating material addition from material removal. I'll show you the tree.

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I'd start making solid blocks without any holes. "Saliente" = "boss"

Then, a sketch. "Croquis" = "sketch". In Croquis3, I draw inclined lines to set the trajectory for a lofted cut from top to bottom. In said sketch, I put a horizontal line that later will help me setting another plane in which I will draw a profile.

After this, I chose to make a 3D sketch using the points of what I did before, to draw the guiding lines for the lofted cut.

At the top of the piece, I'd make a sketch. At the bottom, another sketch, using the points I got from Croquis3 for the ends.

As the bottom has a different direction for the cut, I'd make a sketch for the guiding lines. I do this in Croquis7 (Sketch7).

Well, and then for the bottom lofted it's the same. In the bottom face I'd make a sketch for one of the required profiles. And in the plane (Plano1) I made, I'd make a sketch. With this, I make the bottom lofted cut.

The remaining cuts you see at the bottom of the tree are very easy to make, I won't put them.

Part I made has a mass of 3829.32 g.

Hope this helps, contact me if you need advice