Normally it wouldn't make much sense to do a nether render since most of the interesting parts would be below the bedrock roof, but since the season 10 nether hub is on the roof, there should be a nether render. I scratched my head over the mapcrafter code for a while. I thought I would bring this to your attention since you're probably in a better position to render this than I am. I'll take a crack at it, but no promises.
Normally it wouldn't make much sense to do a nether render since most of the interesting parts would be below the bedrock roof, but since the season 10 nether hub is on the roof, there should be a nether render. I scratched my head over the mapcrafter code for a while. I thought I would bring this to your attention since you're probably in a better position to render this than I am. I'll take a crack at it, but no promises.