Clipped from Comic Art Fan: As documented in Joe Simon's, The Comic Book Makers, after creating the first issue of Captain America, Simon and Kirby formed their own studio moving into a small space, hiring additional artists, embarking on their way to immortality.
a guide to everyone concerned, Simon created a model sheet depicting
Cap and Bucky, noting the changes in costume, shield and relative size
of the characters. Four pin holes demonstrate how the model sheet was
exhibited in the "studio".
On the back Joe notes
his home address at the time "Haddon Hall" located in Morningside
heights at Columbia University where Joe had first settled after moving
from Syracuse to Manhattan.