VERY nice! What did you use for the leveling? My DIY deadlift platform is very similar (though certainly less pretty), and I also have it set up in the same place you do in the garage. I use some metal shims from Rogue, but those are meant for rack uprights. They help, but barbell still takes a stroll every time I set up. 😒
I just used some thick corrugated cardboard. But you can use leveling mud or roofing shingles, or thin planed board as well. Lots of options if you look around on line on RU-vid or in the forums