I would absolutely love to see this!
Making models is easier than it seems. You can pay for programs like Qubicle, and while that does provide benefits, I can give you a couple of tools to get started if you want! :3
1st on your free-program shopping list is MagicaVoxel. This program is the absolute most important one, you will actually be creating within it. It's free, and a non-intrusive program. The link can be found here. There are also plenty of tutorials for this program online, so getting accustomed is easy~!
2nd, you'll want Blender! Blender is a program specifically designed for proffessional-level 3D modelling, but if that's not what you're into, it can also be used for other things. In this case, you'll want to separately export bits of your model and import them into here, so that you can create things like animations and panning shots. The link can be found here. Blender is so widely used that you can find a tutorial for almost everything, so that should make the complex interface much less intimidating! :3
Lastly, this one is optional. Magicavoxel is fantastic, but one of its weakpoints is that it exports models very oddly, so that faces and vertices are rendered in a very illogical way in blender. If you want to fix that, you can use a simple program made by shivshank to export them more crisply, to allow for easier editing in Blender. The link can be found here, but although it is very straightforward, it is a niche program and might be confusing without prior knowledge.
So here you go! If you want to make 3D fanart for Clone Drone, this should help out a lot. :3