diff --git a/pyproject.toml b/pyproject.toml
index 2bae93e0..d5d1a792 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -171,5 +171,11 @@ no_implicit_reexport = true
 ignore_missing_imports = true
 disallow_untyped_defs = true
 
+[[tool.mypy.overrides]]
+module = ['ome_types.model.ome_2016_06.structured_annotations']
+# Definition of "__iter__" in base class "BaseModel"
+# is incompatible with definition in base class "Sequence"
+disable_error_code = "misc"
+
 [tool.coverage.run]
 source = ["src/ome_types"]
diff --git a/src/ome_autogen/main.py b/src/ome_autogen/main.py
index aeb2c02f..14b7d4dc 100644
--- a/src/ome_autogen/main.py
+++ b/src/ome_autogen/main.py
@@ -61,7 +61,11 @@ def build_model(
         _print_gray("Running mypy ...")
 
         mypy = ["mypy", str(package_dir), "--strict"]
-        subprocess.check_output(mypy)  # noqa S
+
+        try:
+            subprocess.check_output(mypy, stderr=subprocess.STDOUT)  # noqa S
+        except subprocess.CalledProcessError as e:
+            raise RuntimeError(f"mypy errors:\n\n{e.output.decode()}") from e
 
     # print a bold green checkmark
     _print_green(f"\u2713 OME python model created at {OUTPUT_PACKAGE}")
diff --git a/src/ome_types/_mixins/_structured_annotations.py b/src/ome_types/_mixins/_structured_annotations.py
index 00b400ca..5117c908 100644
--- a/src/ome_types/_mixins/_structured_annotations.py
+++ b/src/ome_types/_mixins/_structured_annotations.py
@@ -25,5 +25,5 @@ def __getitem__(self, key: int | slice) -> Annotation | Sequence[Annotation]:
     def __len__(self) -> int:
         return len(list(self._iter_annotations()))
 
-    def __iter__(self) -> Iterator[Annotation]:
+    def __iter__(self) -> Iterator[Annotation]:  # type: ignore[override]
         return self._iter_annotations()
diff --git a/src/ome_types/model/_color.py b/src/ome_types/model/_color.py
index a2540017..bcdae59e 100644
--- a/src/ome_types/model/_color.py
+++ b/src/ome_types/model/_color.py
@@ -1,20 +1,21 @@
-from typing import Any
+from typing import Any, Tuple, Union
 
 from pydantic import color
 from xsdata.formats.converter import Converter, converter
 
 __all__ = ["Color"]
 
+ColorTuple = Union[Tuple[int, int, int], Tuple[int, int, int, float]]
+ColorType = Union[ColorTuple, str, int]
+
 
 class Color(color.Color):
-    def __init__(self, val: color.ColorType = -1) -> None:
+    def __init__(self, val: ColorType = -1) -> None:
         try:
-            val_int = int(val)  # type: ignore
+            val = self._int2tuple(int(val))  # type: ignore
         except ValueError:
             pass
-        else:
-            val = self._int2tuple(val_int)
-        super().__init__(val)
+        super().__init__(val)  # type: ignore [arg-type]
 
     @classmethod
     def _int2tuple(cls, val: int) -> tuple[int, int, int, float]:
diff --git a/tests/test_autogen.py b/tests/test_autogen.py
index d6afcc0a..ef5d4e6a 100644
--- a/tests/test_autogen.py
+++ b/tests/test_autogen.py
@@ -2,19 +2,22 @@
 import sys
 from pathlib import Path
 
-import pytest
+from _pytest.monkeypatch import MonkeyPatch
 
-ome_autogen = pytest.importorskip("_ome_autogen")
-XSD = Path(__file__).parent.parent.parent / "src" / "ome_types" / "ome-2016-06.xsd"
+import ome_autogen.main
 
 
-def test_autogen(tmp_path_factory):
+def test_autogen(tmp_path: Path, monkeypatch: MonkeyPatch) -> None:
     """Test that autogen works without raising an exception.
 
-    This does *not* actually test the resulting model.
+    and that mypy has no issues with it.
     """
-    target_dir = tmp_path_factory.mktemp("_ome_types_test_model")
-    ome_autogen.convert_schema(url=XSD, target_dir=target_dir)
-    sys.path.insert(0, str(target_dir.parent))
-    assert importlib.import_module(target_dir.name)
-    sys.path.pop(0)
+    ome_autogen.main.build_model(output_dir=tmp_path, do_formatting=True, do_mypy=True)
+
+    monkeypatch.delitem(sys.modules, "ome_types")
+    monkeypatch.delitem(sys.modules, "ome_types.model")
+    monkeypatch.delitem(sys.modules, "ome_types.model.ome_2016_06")
+    monkeypatch.syspath_prepend(str(tmp_path))
+    mod = importlib.import_module("ome_types.model.ome_2016_06")
+    assert mod.__file__ and mod.__file__.startswith(str(tmp_path))
+    assert mod.Channel(color="blue")