I think your idea has real value and I think the timing is very good also. Teaching is always a collaborative process, but during the pandemic people in general have become more comfortable with virtual meetings and connecting through technology. Since you are considering including teacher from other buildings in your district, could you include a section where other teachers could share their content map for the year, that way the district could identify overlaps and gaps? I know mapping isn't a new and necessarily innovative approach, but when I was a computer teacher, I was always looking for ways to collaborate and build on other classes and maps were very helpful for that.