You're going to need 2 programs to start this off. First, You'll need SLADE, which can be found here.
Then you're going to need Ultimate Doom Builder. Which can be found here.
https://forum.zdoom.org/viewtopic.php?t=66745
So, to remove the cutscene you're going to need to open Vomitoreum.ipk3 in SLADE which will give you access to vomitmaps.wad
From there, place vomitmaps.wad somewhere you can easily access it and open it up in Ultimate Doom Builder.
When you have it open, you can go to the hole you drop down in the Station (Found here. https://imgur.com/qODrwhj ) and go into Things mode in Doom Builder, Right click on the lightning bolt in the middle of the hole.
Change the Action to Teleport (silent) and from there, change the "Target Teleport Dest. Tag to the number 110.
From there, Save the file and replace the original vomitmaps.wad in SLADE, Save, and you should be good to go!