  The Proton Improvement Plan-II (PIP-II, [1]) linac will include 35 Single
Spoke Resonators type 2 (SSR2). A total of eight pre-production SSR2 jacketed
cavities will be procured and five installed in the first pre-production
cryomodule. The mechanical design of the jacketed cavity has been finalized and
it will be presented in this paper along with fabrication and processing
experience. The importance of interfaces, quality controls and procurement
aspects in the design phase will be remarked as well as lessons learned during
the fabrication process. Furthermore, development studies will be presented
together with other design validation tests.
