Since I have not been able to find a decent 3D drawing of the Jupiter ACE housing I created this myself in Designspark Mechanical.
I do not own one to take measurements from, so I collected as much photos as possible, preferably from the sides and top. The only fixed measures I had were those of the PCB, which I used as the basis. Then I placed the photos on different layers and scaled the 3D model until it fits the images.
What I overlooked in the first place was that the housing of the ACE is significantly larger than that of a ZX-80, which I previously printed successfully. So I had to split the model into printable parts.
And once assembled, the top section looks a lot like the original.