Welcome @Gubgub45, I am not a coder and am just interested at the moment in everything which can help me creating mods for Stonehearth, i.e. Lua, JavaScript, Qubicle and Animations. I am not writing own games and if I would want to, probably would use an engine like Unity (as my coding skills are at least rusted).
I would be astonished if you are able to simply load a .qmo-file in C#. Qubicle is using a proprietary file format and did not disclose its details, so where should C# know from, what to do with the file? The easiest way might be to export your model into someonething more common like an .obj-file and look for a guide on how to access .obj-files in C#.
Someone who might be a better fit for deeper discussions on this topic is @FinKone. Maybe drop him a PM or leave a short message in the thread related to his game.
Sorry that I am not able to help you too much with this.