Bla went to bed like 2 minutes before I got this question.
As far as mapping the nether goes, we have 2 options, have netherrack, bedrock and flowing&still lava not shown. Or just render the 50-75 y coordinates which encompasses a decent percentage of what has actually been built in the nether. Which is preferred?
Without bedrock, netherrack and lava:
Layers 50-75 (maybe change them a bit?)
They are both centered on the blaze farm nether fortress.