OK, all understood.
There is a "Plan B" which I had in mind but didn't mention it because I thought the idea of bought in solution may be more attractive.
If the PCB for the fuse holders and terminals is made from double sided board, you can have copper pads on the top of the board and solder the body of the screw terminal to those pads.
Looking at the commercial example which you have shown, it looks as though the people who made that unit did exactly that.
If my interpretation of the picture is correct, there are copper pads under the terminals and some of them appear to be soldered.
View attachment 112003
What do you think?
JimB