There’s a similar thread in IMHO: I’m looking for a model of the 8 planets and earth’s moon that are TO SCALE My contribution referenced The Thousand Yard Model (or the Earth as a Peppercorn) https://lavinia.as.arizona.edu/~dmccarthy/GSUSA/activities/Additional%20Files/Thousand%20Yard%20SS%20Earth%20is%20Peppercorn.pdf
It includes Pluto, FWIW. If you stop at Neptune it would be about 750 yards. If your scale is much smaller, the planets will not be visible on the same scale as the interplanetary distances. Earth is a peppercorn in this model. Shrinking the model from 1,000 yards to 12 yards is about a factor of 100. That takes the Earth from about 2 millimeters in diameter to about 0.02 mm or 200 microns - as wide as 2 or 3 human hairs.