I'm already toying with a tweak to the sequence.
My fear is that the unit on linear equations (slope, graphing, solving, etc) is going to be the hardest to implement with a true modeling approach. If that's the case, I don't want to disrupt any momentum I build in the first unit by deviating from the discover & discuss method before returning to it when we finish linear equations. So why not just switch Units 1 & 2 and make linear equations first?
It should serve as a (hopefully) easy introduction to my class as it's mostly a review of 9th grade algebra. It will give me time to get to know my class and set expectations for discussion and I can already see bridging from lines -> segments/angles (where I couldn't see a natural transition for the reverse).
On that note, does anyone teach slope / linear equations from a student centered perspective?