Checking it off against the kit inventory listed on Stuart's website the kit looks to be complete bar two steel crosshead pins - possibly missing from the one opened "blister" on the packaging.
Everything else, including fasteners, gaskets and spanner for assembly, appear to be present.
| bore x stroke/inches | 3/4 x 3/4 |
| wheel material | cast iron |
| cylinder material | cast iron |
| valve type | slide |