  This contribution reports the design of the production Single Spoke Resonator
Type 1 Cryomodule (SSR1 CM) for the PIP-II project at Fermilab. The innovative
design is based on a structure, the strongback, which supports the coldmass
from the bottom, stays at room temperature during operations, and can slide
longitudinally with respect to the vacuum vessel. The Fermilab style cryomodule
developed for the prototype Single Spoke Resonator Type 1 (pSSR1), the
prototype High Beta 650 MHz (pHB650), and preproduction Single Spoke Resonator
Type 2 (ppSSR2) cryomodules is the baseline of the present design. The focus of
this contribution is on the results of calculations and finite element analyses
performed to optimize the critical components of the cryomodule: vacuum vessel,
strongback, thermal shield, and magnetic shield.
