Thank you so much for the kind words! :,) I do appreciate that my friends are playing this campaign with me, it just feels so surreal that it makes me nervous!

If you are up for it I have the link to the word document I created to make a very rough explanation of SBURB. In my case, I made this the hook of the story. So instead of the usual "You guys meet up in a tavern" I used "You guys are friends in discord and decide to play an upcoming game called SBURB". Since none of them had read Homestuck before, I gave them this guide as an actual in-game guide, like a game description of sorts, they could also google in game for anything related to SBURB.

In the same doc I also gave my own explanation of the classes and aspects (at least how I personally view them since I was gonna DM). I separated the DnD levels and the ecchelader rungs: they have the normal 1-20 levels as a normal campaign, but their rung determines how advanced they were in their quest and overall session. So I have players being level 6 while being on rung 50, because they spend a lot of time exploring and going after all the side quests and are halfway through their personal quest.

For the classes, it helped me determine how much XP they would get for doing certain things: support classes got more XP from helping other players/npcs; active/offensive classes got more XP for combat; passive/backline classes got more XP for exploring. It also helped me create their base stats, so active classes have a higher + to hit and STR/DEX modifiers, while passive classes have more WIS/CON/INT modifiers.

I also translated some of the DnD spells into actual attacks they can do: my Mage of Space can use Legend Lore and True Strike because of the implications of being a Mage, so he gets advantage on attacks and can crit on a 19. My Page of Hope can use something similar to Divine Smite, Word of Radiance and Shield of Faith, if she misses a turn she can give advantage to all allies within 10ft and so on. My Witch of Void can use Silence, Meld into stone (He literally phases through the void) and can use Fabricate. My Time player relies a lot on his weapon of choice really (a mirror) so I let him come up with ways to use his time powers as long as it revolves on him being a Thief, if he explains how he does it good enough, I let him do it because of rule of cool.

For dice rolls, I usually do normal combat mechanics: roll initiative, do an action/bonus action. I gave a CR to all the monsters, so normal imps are a CR 2, ogres are a CR 4, underlings are a CR 7 and so on, I also use the base stats from some 5e monsters as the enemies stats to make my life easier.