The incredibly talented Kathy Zimmerman designed the Waltham to fit a variety of figures - but not one exactly like mine. This isn't unique to the Waltham. It's true for almost all sweaters which designers create with parallel, rectangular sides.
Therefore, I declared myself Queen of the Mods and redesigned the shape of the Waltham to match mine, as shown in the schematic below.
Waltham KAL group have knitted Walthams that are shaped exactly like Kathy designed them: rectangularly.
At least my knitted piece matches my schematic, but will this thing actually fit??? Only the fit test will tell, so I pinned it to my shirt.
Does it fit? YES! It fits! I hope. At least I think so. It's a good harbinger of a nice sweater at the very least.