Nice job on the box and also on the video,
much better music selections than most online videos I have seen, I had no inclination to turn the volume off!
Is this the kind of tool you used for the thread? Double Angle Chamfer although this looks like it has a 3/8 shank
I am also interested in how you did the threads.
Great job on the box. Looks great. 
Wanted to add my Kudos for the quality of both the video and the box itself and thanks for sharing.
Yes, That’s the tool 
They do come cheaper. It’s even possible to grind a t-slot bit at an angle. Or let it be done by a professional.
Hi,
May I know what are the dimensions of the stock you are using? I want to try to use the Gcode files you posted in the project section but I don’t know what thickness of lumber to use.
Great video and project!