Quoted from Homepin:
Some have asked me why we have a small coin door on our prototypes. Well, we have been experimenting with various different setups and here are a couple of pictures of what we are currently favoring. A single coin slot on a small door and a note acceptor alongside (we will be including an electronic, programmable coin mech with EVERY pinball machine).
The note acceptor is obviously expensive and for HUO would not be required so we are looking at different ways of dealing with the option.
This setup is not final yet but it looks OK and leaves easy options down the track for different owners.
As it is still in experimental stage, will say that aesthetically it just doesn't look very good. Sometimes if it ain't broke....
I do like the care and attention to detail re QC of all the parts shown.