I already looked at some structures, i.e. Wind Trap is 64x96 pixels and I would like to make them at least a double / triple of that size. I always prefer 512 pixels per sprite if possible.
It means 1024x spritesheet with 4 frames animation OR 2048x spritesheet with 16 frames animation per structure.
I believe, to make it work somebody have to update the code saying, that the new structure is taken more space on the field etc. My point is, I dont want to have zoom out resolution and make everything tiny, I want to keep same close up camera as the original and add hires images of new version. Something like a remake of Starcraft.
Back to your question, yes! I would re-render / re-paint all units, also work on new animations per unit / structure etc. Lots of work, and I would be willing to do that, if it would be supported.