What are the current rules for the speedruns?

No mods obviously.

Watching the current WR it looks like it was started from a savegame (albeit empty), is that for a reason?

Anything else besides recording video required to make it official? Thanks!

Oh, and the WR is for Megapolis at 70k .. it's 90k now for Megapolis .. what to do about that?

What is "external assets"? I fail to find it in the game.

External like mods from the steam workshop

Hi! I turned off all mods except for the unlimited money mod (as I want to do a run in that subcategory). To make sure I'm in full compliance with the rules, would external assets include, say, residential buildings and service buildings that were downloaded from the Steam Workshop?

Yes anything from the steam workshop is external