A year after its initial release, Plasmaplant is now closer to the level I wanted it to be, the last bit of topping being new monsters Clusterfiend and Midasfiend. If you've already played the level, nothing much has changed in the layout, but the two new offerings to Doom's bestiary are a waft of fresh air, for players and Doom level designers alike.
The above file is Plasmaplant 2015 edition.
This file contains only the two monsters pictured. Feel free to use as you see fit.