@ Boot_WB
Don't forget that you are not limited by the maximum screen resolution of your GFX card in terms of producing renders of a certain resolution. Back in the day, when I was still using the Amiga for raytracing, I made several renders using Cinema4D at a resolution of 4000 x 3000 pixels. And I didn't even have a GFX card. Just make sure you select no output to screen. I found that with large files like that I had to use Image FX to make minor adjustments to the image or to resize and make previews for viewing on other machines. Funny enough for more complex manipulations I was forced to run Shapeshifter (or Fusion, I can't remember which) and then use Photoshop to make those changes.
Render times even on 060 are quite long and if you have a high polygon count you are going to get through memory very quickly. My machine had 146mb of RAM back then and in some scenes I ate most of that. It is amazing what the Amiga could do. These days I use PC for rendering, it just makes sense if you have one available. My last project was a medical poster starting at 7000 x 11000 pixels with 16 layers and I can't see myself managing to do that on the Amiga even though I now have 272mb of RAM on it. As it stands, even on a dual core PC with more than 3gb of RAM and SATA RAID, loading and manipulating times were long. I could probably handle the final image on the Amiga (it is 7075 x 5020) but it would involve lots of coffees...