Between 2010 when I took the car apart, and whenever I finally painted the firewall, (maybe 2014?) we moved twice, and the kids kept us very busy. I worked on it when I felt like it, but over those 4(?) years, it mostly collected dust with short bursts of progress every six months or so.
I blame the kids. It's entirely their fault. I would never leave a project unfinished for years on my own.