Constanza Kit has just released a 1/72nd SZD-50-3 Puchacz resin kit - ref. CON807219
Source: https://www.aviationmegastore.com/szd-50-3-puchacz-con807219-constanza-kits-con807219-glider-aircraft-moldelling/product/?action=prodinfo&art=157486
V.P.