Hello everyone. I know it can be made with some work using Capture to a 2D Texture and then assigning that texture in a material for use in the widget, but it would be more simple, and the result would be nicer, if UE4 had a blueprint with the purpose to render a imagem from a given static mesh.
Im not sure but you can do some basic drawing in a canvas render target no? 
Using this i think you could draw a mesh, but theres no lighting available for this. You need to fake the lighting in the material.
But i say +1 for this since i was looking for something similar a few months ago and it would be nice to have some more refined solution.
Yes Azarus, there are a couple of ways to do it, but none of them are perfect.
About the lighting problem you talke about, there is a solution: Render 3D objects in UMG Widget/HUD | EngineUnreal
But I hope that in the future versions there is a native solution for that in UE4. There are a lot of systems and projects that would benefit from it.
I have a similar request: