no, it's not possible...but David said something about importing 3d models feature, it may be in the next build.
Of course it's possible to create the illusion of 3D models in a 2D platformer.
The Donkey Kong Country games did that years ago on the SNES (love those games), as did many others, albeit not as well as the DKC games.
Render your 3D models in Max and import them.
Simple as that.
I'm looking forward to the OBJ importer, if it happens, but don't expect that to open up Construct to full 3D games.
At best, we'll have control over 3D meshes from a single 2D perspective, and although that will open up a lot of possibilities, you'll still need to look elsewhere if you want to create 3D games.