Interesting project 
As you can probably tell, I'm not interested in selling kits (I know, they are great, except when they are not, and helping people debug issues via email sucks up way too much time.)
But, I'd be happy to run a batch of boards for someone here to make kits, as a bulk thing.
I think, though, I'd recommend adding back in the inverter for the LED, and at least put the pads for the DB15 parallel cable. Being able to nibble make ZF much more useful, and it's not like one has to populate it.
Glad to see folks are enjoying the tools.
P.S., On this note on the original site: "The ZoomFloppy is the product of several iterations of design based around AVR microcontrollers. The original version used a 3.3V AT90USBKEY development board which required resistors to lower the 5V input from the IEC bus. These resistors are also present on the ZoomFloppy board but are not necessary since the ZoomFloppy uses an ATmega32U2 running at 5Vs so they have been removed in the mini xum1541 design."
While it is true the original design used a dev board, the resistors were not a holdover. We added them so the unit could not be back powered from the IEC bus if the IEC bus was operational before USB power was applied. So, since this design omits the resistors, be careful about order of startup... (No, backfeeding won't kill an AVR immediately, but it's not good for it at all...)
Jim
As you can probably tell, I'm not interested in selling kits (I know, they are great, except when they are not, and helping people debug issues via email sucks up way too much time.)
But, I'd be happy to run a batch of boards for someone here to make kits, as a bulk thing.
I think, though, I'd recommend adding back in the inverter for the LED, and at least put the pads for the DB15 parallel cable. Being able to nibble make ZF much more useful, and it's not like one has to populate it.
Glad to see folks are enjoying the tools.
P.S., On this note on the original site: "The ZoomFloppy is the product of several iterations of design based around AVR microcontrollers. The original version used a 3.3V AT90USBKEY development board which required resistors to lower the 5V input from the IEC bus. These resistors are also present on the ZoomFloppy board but are not necessary since the ZoomFloppy uses an ATmega32U2 running at 5Vs so they have been removed in the mini xum1541 design."
While it is true the original design used a dev board, the resistors were not a holdover. We added them so the unit could not be back powered from the IEC bus if the IEC bus was operational before USB power was applied. So, since this design omits the resistors, be careful about order of startup... (No, backfeeding won't kill an AVR immediately, but it's not good for it at all...)
Jim