Here's a fine pickle! A piano with no keyboard! The paper keys are completely gone. So we have the bones of a piano. Maybe you can replace them with a printed set from your draw program?
The Kage Company of Manchester, Connecticut, mass-produced wooden dollhouse pieces from 1938-1948 in about 3/4" to a foot, slightly smaller than today's conventional 1:12" scale. The piano is 3-1/8" from front to back, 2-3/8" wide, and 2-1/4" tall.There is some slight scrubbing to it on one edge.