diff --git a/CMakeLists.txt b/CMakeLists.txt
index fa4de1e5..8f0980d0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -46,6 +46,7 @@ add_library(lego1 SHARED
   LEGO1/jukeboxstate.cpp
   LEGO1/legoact2state.cpp
   LEGO1/legoactioncontrolpresenter.cpp
+  LEGO1/legoactor.cpp
   LEGO1/legoanimactor.cpp
   LEGO1/legoanimationmanager.cpp
   LEGO1/legoanimmmpresenter.cpp
diff --git a/LEGO1/isleactor.cpp b/LEGO1/isleactor.cpp
index ca286e37..a28afc6b 100644
--- a/LEGO1/isleactor.cpp
+++ b/LEGO1/isleactor.cpp
@@ -1 +1,4 @@
 #include "isleactor.h"
+
+// NOTE: This is copied from base class LegoActor. IsleActor may in fact be larger but we don't know yet.
+DECOMP_SIZE_ASSERT(IsleActor, 0x78)
diff --git a/LEGO1/legoactor.cpp b/LEGO1/legoactor.cpp
new file mode 100644
index 00000000..c26cc1fc
--- /dev/null
+++ b/LEGO1/legoactor.cpp
@@ -0,0 +1,3 @@
+#include "legoactor.h"
+
+DECOMP_SIZE_ASSERT(LegoActor, 0x78)
diff --git a/LEGO1/legoactor.h b/LEGO1/legoactor.h
index 9b23e943..828f48ad 100644
--- a/LEGO1/legoactor.h
+++ b/LEGO1/legoactor.h
@@ -1,6 +1,7 @@
 #ifndef LEGOACTOR_H
 #define LEGOACTOR_H
 
+#include "decomp.h"
 #include "legoentity.h"
 
 // VTABLE 0x100d6d68
@@ -20,6 +21,10 @@ class LegoActor : public LegoEntity
   {
     return !strcmp(name, LegoActor::ClassName()) || LegoEntity::IsA(name);
   }
+
+private:
+  undefined unk04_[0x68];
+
 };
 
 #endif // LEGOACTOR_H
diff --git a/LEGO1/pizza.cpp b/LEGO1/pizza.cpp
index d4d5fd2f..93f67aaa 100644
--- a/LEGO1/pizza.cpp
+++ b/LEGO1/pizza.cpp
@@ -1,5 +1,9 @@
 #include "pizza.h"
 
+#include "decomp.h"
+
+DECOMP_SIZE_ASSERT(Pizza, 0x9c);
+
 // OFFSET: LEGO1 0x10037ef0
 Pizza::Pizza()
 {
@@ -23,4 +27,4 @@ MxResult Pizza::Tickle()
 {
   // TODO
   return SUCCESS;
-}
\ No newline at end of file
+}
diff --git a/LEGO1/pizza.h b/LEGO1/pizza.h
index 94a46936..34d781c9 100644
--- a/LEGO1/pizza.h
+++ b/LEGO1/pizza.h
@@ -30,12 +30,14 @@ class Pizza : public IsleActor
     return !strcmp(name, Pizza::ClassName()) || IsleActor::IsA(name);
   }
 private:
+  MxS32 m_unk78;
   MxS32 m_unk7c;
   MxS32 m_unk80;
   MxS32 m_unk84;
   MxS32 m_unk88;
   MxS32 m_unk8c;
   MxU32 m_unk90;
+  MxS32 m_unk94;
   MxS32 m_unk98;
 };