Yes as noted in the other post you want to set the size in inches (which you have been doing). I have been working on a part between fighting with github on source changes today and am mostly finished. Here is rough outline of how I did it.
The fc51.fzpz file referred to is a similar board (but with only 3 pins where this one needs 7) that I made some months ago for someone. If you search for it in the forums it should come up. I’ll post a copy of it when I finish it in a bit.
edit the fc51.fzpz file in parts editor to change the metadata
export it as hcmmodu0083.fzpz
unzip it with 7zip to get the svg files
edit the breadboard svg with Inkscape
use deepungroup to ungroup everything
delete all components except the connector
resize the base rectangle to the dimensions of the new board change the color to red
from fritzing create a new part and export screw terminal 2 pin.
unzip the fzpz file with 7zip
edit in Inkscape the breadboard svg
ungroup everything. Copy the entire part via edit->copy
and copy it in to the new breadboard svg.
duplicate it for the 2n terminal
set a rectange on each of the four screw terminals as
need to add these to the fzp file as well)
copy in a to220 transitor case for the mosfet.
Align the pins to .1 boundaries
regroup it and set the id to breadboard.
Set the connector terminal widths to 10thou (missed this when I made this part) on connectors 0-2. Made the rectangle larger and added pin / terminal and labels for connectors 3-6
(the screw terminals). Changed the text on the labels and pin numbers to reflect the new part.
PCB left as is, it only shows the 3 signal lines not the screw terminals (which causes some changes in the fzp file below).
left the pin 0 to 2 definitions as is.
Duplicated the connector2 entry (from connector to \connector) for pins 3 to 6. With the following changes:
in the breadboard defiintion
p svgId=“connector2pin” terminalId=“connector2terminal” layer=“breadboard”
p svgId=“connector2pin” layer=“breadboard”
because the screw terminals don’t have or need a terminal definition in the svg.
and the pcb view definition changes from
p svgId=“connector2pin” layer="copper0
p svgId=“connector2pin” layer="copper1
so the 4 screw terminals have no connectors in pcb view. Once it is all done run the part through FritzingCheckPart.py to check it, then copy the breadboard svg to the icon svg to set the correct icon and rezip the files in to an fzpz file suitable for loading to Fritzing. That gives us this part:
hcmmodu0083.fzpz (16.6 KB)
which the original poster can use for his project. What I would suggest for you is that you start from the fc51.fzpz file and see if you can get the same part I did (yours will have a new moduleId and thus load alongside the one above) follwoing the steps above using either Illustrator or Inkscape or both and ask about anything that isn’t clear.