diff --git a/LEGO1/lego/legoomni/include/registrationbook.h b/LEGO1/lego/legoomni/include/registrationbook.h
index 70239505..aeede1d0 100644
--- a/LEGO1/lego/legoomni/include/registrationbook.h
+++ b/LEGO1/lego/legoomni/include/registrationbook.h
@@ -35,23 +35,25 @@ class RegistrationBook : public LegoWorld {
 	// RegistrationBook::`scalar deleting destructor'
 
 private:
-	undefined4 m_unk0xf8;       // 0xf8
-	undefined m_unk0xfc;        // 0xfc
-	undefined m_unk0xfd[0x183]; // 0xfd
-	undefined4 m_unk0x280;      // 0x280
-	undefined4 m_unk0x284;      // 0x284
-	undefined4 m_unk0x288;      // 0x288
-	undefined2 m_unk0x28c;      // 0x28c
-	undefined2 m_unk0x28e;      // 0x28e
-	undefined m_unk0x290[0x28]; // 0x290
-	undefined2 m_unk0x2b8;      // 0x2b8
-	undefined m_unk0x2ba[0x02]; // 0x2ba
-	undefined4 m_unk0x2bc;      // 0x2bc
-	undefined m_unk0x2c1;       // 0x2c1
-	undefined m_unk0x2c2[0x02]; // 0x2c2
-	undefined4 m_unk0x2c4;      // 0x2c4
-	undefined4 m_unk0x2c8;      // 0x2c8
-	undefined4 m_unk0x2cc;      // 0x2cc
+	undefined4 m_unk0xf8;        // 0xf8
+	undefined m_unk0xfc;         // 0xfc
+	undefined m_unk0xfd[3];      // 0xfd
+	undefined m_unk0x100[0x68];  // 0x100
+	undefined m_unk0x168[0x118]; // 0x168
+	struct {
+		undefined4 m_unk0x00[3]; // 0x00
+		undefined2 m_unk0x0c;    // 0x0c
+		undefined2 m_unk0x0e;    // 0x0e
+	} m_unk0x280;                // 0x280
+	undefined m_unk0x290[0x28];  // 0x290
+	undefined2 m_unk0x2b8;       // 0x2b8
+	undefined4 m_unk0x2bc;       // 0x2bc
+	undefined m_unk0x2c0;        // 0x2c0
+	undefined m_unk0x2c1;        // 0x2c1
+	undefined m_unk0x2c2[0x02];  // 0x2c2
+	undefined4 m_unk0x2c4;       // 0x2c4
+	undefined4 m_unk0x2c8;       // 0x2c8
+	undefined4 m_unk0x2cc;       // 0x2cc
 };
 
 #endif // REGISTRATIONBOOK_H
diff --git a/LEGO1/lego/legoomni/src/infocenter/registrationbook.cpp b/LEGO1/lego/legoomni/src/infocenter/registrationbook.cpp
index 41a7aeca..f4b17194 100644
--- a/LEGO1/lego/legoomni/src/infocenter/registrationbook.cpp
+++ b/LEGO1/lego/legoomni/src/infocenter/registrationbook.cpp
@@ -3,24 +3,29 @@
 #include "legoomni.h"
 #include "mxnotificationmanager.h"
 
-// STUB: LEGO1 0x10076d20
-RegistrationBook::RegistrationBook()
+DECOMP_SIZE_ASSERT(RegistrationBook, 0x2d0)
+
+// FUNCTION: LEGO1 0x10076d20
+RegistrationBook::RegistrationBook() : m_unk0xf8(0x80000000), m_unk0xfc(1)
 {
-	m_unk0xf8 = 0x80000000;
-	m_unk0xfc = 1;
-	m_unk0x28e = 0;
-	m_unk0x280 = -1;
-	m_unk0x284 = -1;
-	m_unk0x288 = -1;
-	m_unk0x28c = -1;
+	memset(m_unk0x100, 0, sizeof(m_unk0x100));
+	memset(m_unk0x168, 0, sizeof(m_unk0x168));
+
+	// Maybe not be part of the struct, but then it would need packing
+	m_unk0x280.m_unk0x0e = 0;
+
+	memset(m_unk0x290, 0, sizeof(m_unk0x290));
+	memset(&m_unk0x280, -1, sizeof(m_unk0x280) - 2);
+
 	m_unk0x2b8 = 0;
 	m_unk0x2bc = 0;
+
+	NotificationManager()->Register(this);
+
 	m_unk0x2c1 = 0;
 	m_unk0x2c4 = 0;
 	m_unk0x2c8 = 0;
 	m_unk0x2cc = 0;
-
-	NotificationManager()->Register(this);
 }
 
 // STUB: LEGO1 0x10076f50