are there any mods that extend episode one?

[OnionTaco22]

I have been looking for a mod that will extend the levels of episode one by a bit while still now making them stupidly hard but I haven't found one yet, so does anyone know a good one??

[Shepardus]

Maps of Chaos, Knee-Deep in ZDoom, Knee-Deep in Knee-Deep in ZDoom

[houston]

Maybe you could try interspersing some of the levels from Doom the way Id Did?