Good price on the tool box, I like black. For my controller
I spent more than that just on paint.
I also really like the controls and I am just stunned by how much you have managed to pack in there. It just looks really well laid out.
I am also a fan of big heatsinks mounted externally. It's a logical choice to have both heatsink and cables at the back, I'm sure you have thought about how much clearance you have there. I don't want to come across as critical because I really like the build, but the airflow would be slightly better if the orientation of the fins was vertical rather than horizontal. All the same I would like to know where you got it, it's a great size.
Looking good Vadim!