No worries! I'd love to hit you up with some questions. I'm curious about the process and tools around level design - do you use a brush based tool like Trenchbroom, or model the level and parts in Blender or similar? Do you plan everything (or most things) in advance, or do you just start working and iterate?
When I figured everything out I can do a 0 kill Mastery in <4 minutes and it's not so hard. Far harder was actually was to get all 41 Hellionaires, while maintaining Mercy and Prowess. Couldn't do it without exploity tactics like luring enemies away one by one, or running away to get them to deaggro and picking them off slowly. While hand to hand is fun alone, having *no* access to weapons, and also having to spare the workers who are all too happy to kill me is too much :).
Edit: Don't think it's possible to do it while also maintaining Grace.