Yeah it's quite the massive jam, thanks in no small part to the fact that it's now a partial - or total - conversion. Whatever it falls under nowadyas (def would be a TC in the past!). As for me, I haven't forgotten about WRATH and that to me sits in a similar area of 'Quake but new' for me to make my own, custom episode. Speaking of which....
If the maps in this were planned for level-by-level progression and rune acquisition from the getgo then MAYBE dividing them up into 4 episodes would be feasible, but they'd haveta mod in shotgun starts and the like. Also the mod should be way smaller map-wise and it would require unnecessary 'extra work' for it to happen at this point, even with shotgun starts per map. People pointing their maps to another author's maps, certain maps would be 'boss' levels with a rune, etc.