hi there!! first off, the concept you laid out sounds super intriguing!! i feel like it'll be right up my alley once you post more info on it!!
secondly, i'm pretty familiar with twine 1.4x, so i can help you out with it! that theme from l's blog will only work in 1.4, not twine 2. you can probably try switching if you want— in my opinion, twine 1.4 is a lot easier to use and has more functions/scripts. but i do believe there's guides out there for modding the appearance of twine 2? it's all css— i could play with it a little and help you out if you'd like. o: