diff --git a/src/codecs/miles/miles_impl.cpp b/src/codecs/miles/miles_impl.cpp
index ed56aa71..9de48fa9 100644
--- a/src/codecs/miles/miles_impl.cpp
+++ b/src/codecs/miles/miles_impl.cpp
@@ -40,9 +40,10 @@ bool Miles_Initialize()
 		// if we are loading english and the file is still not found, we can let it hit the regular engine error, since that is not recoverable
 		if (!FileSystem()->FileExists(baseStreamFilePath.c_str()))
 		{
-			Error(eDLL_T::AUDIO, NO_ERROR, "%s: attempted to load language '%s' but the required stream bank (%s) was not found. falling back to english...\n", pszLanguage, baseStreamFilePath.c_str());
+			Error(eDLL_T::AUDIO, NO_ERROR, "%s: attempted to load language '%s' but the required streaming source file (%s) was not found. falling back to english...\n", __FUNCTION__, pszLanguage, baseStreamFilePath.c_str());
 
 			pszLanguage = MILES_DEFAULT_LANGUAGE;
+			miles_language->SetValue(pszLanguage);
 		}
 	}
 
@@ -67,7 +68,27 @@ void MilesQueueEventRun(Miles::Queue* queue, const char* eventName)
 
 void MilesBankPatch(Miles::Bank* bank, char* streamPatch, char* localizedStreamPatch)
 {
-	// TODO [REXX]: add print for patch loading when Miles::Bank struct is mapped out a bit better with file name
+	if (miles_debug.GetBool())
+	{
+		Msg(eDLL_T::AUDIO,
+			"%s: patching bank \"%s\". stream patches: \"%s\", \"%s\"\n",
+			__FUNCTION__,
+			bank->GetBankName(),
+			V_UnqualifiedFileName(streamPatch), V_UnqualifiedFileName(localizedStreamPatch)
+		);
+	}
+
+	const Miles::BankHeader_t* header = bank->GetHeader();
+
+	if (header->bankIndex >= header->project->bankCount)
+		Error(eDLL_T::AUDIO, EXIT_FAILURE,
+			"%s: Attempted to patch bank '%s' that identified itself as bank idx %i.\nProject expects a highest index of %i\n",
+			__FUNCTION__,
+			bank->GetBankName(),
+			header->bankIndex,
+			header->project->bankCount - 1
+		);
+
 	v_MilesBankPatch(bank, streamPatch, localizedStreamPatch);
 }
 
diff --git a/src/codecs/miles/miles_types.h b/src/codecs/miles/miles_types.h
index bae8703a..3ac735e1 100644
--- a/src/codecs/miles/miles_types.h
+++ b/src/codecs/miles/miles_types.h
@@ -4,6 +4,9 @@ constexpr char MILES_DEFAULT_LANGUAGE[] = "english";
 
 namespace Miles
 {
+	constexpr int TEMPLATEID_FLAG_SOURCE = 0x40000000;
+
+
 	struct Queue
 	{
 		char gap0[0x8];
@@ -11,8 +14,107 @@ namespace Miles
 		char gap10[0x20];
 	};
 
+	struct BankHeader_t;
+
+	struct Source_t
+	{
+		BankHeader_t* bank; // reserved on disk - written at runtime
+		char gap8[80];
+	};
+
+	struct Event_t
+	{
+		int nameOffset;
+		int unkOffset; // offset into BankHeader_t::unk_68 data - some sort of event metadata?
+	};
+
+	// internal project data structure
+	struct IntProjectData_t
+	{
+		char gap0[0xCF0];
+		int bankCount;
+		BankHeader_t** loadedBanks;
+	};
+
+	struct BankHeader_t
+	{
+		int magic;     // 'CBNK'
+		int version;   // 32
+		uint32_t dataSize;
+
+		int bankMagic; // 'BANK'
+		const char* bankName;
+
+		void* unk_18;
+		IntProjectData_t* project;
+
+		void* unk_28;
+		void* unk_30;
+		void* unk_38;
+		void* unk_40; // used to index into both sources and localised sources
+
+		Source_t* sources;
+		Source_t* localizedSources;
+
+		void* unk_58;
+		Event_t* events;
+
+		void* unk_68;
+		const char* stringTable;
+
+		void* unk_78;
+		void* unk_80;
+		void* unk_88;
+
+		uint8_t bankIndex;
+		// 3 byte padding
+
+		uint32_t localizedSourceCount;
+		uint32_t sourceCount;
+
+		uint32_t patchCount;
+		uint32_t eventCount;
+
+		uint32_t count_A4;
+		uint32_t count_A8;
+		uint32_t count_AC;
+
+		uint32_t buildTag;
+
+		uint32_t unk_B4;
+		uint32_t someDataSize;
+
+		const char* GetBankName() const
+		{
+			return bankName;
+		}
+
+	};
+	static_assert(offsetof(BankHeader_t, project) == 0x20);
+	static_assert(offsetof(BankHeader_t, stringTable) == 0x70);
+	static_assert(offsetof(BankHeader_t, unk_B4) == 0xB4);
+
+
 	struct Bank
 	{
-		// TODO [REXX]: map out this struct and its internal counterpart
+		void* internalData;
+		void* unk_8;
+
+		char* fileData;
+
+		int unk_18;
+		char gap_1c[4];
+
+		const Miles::BankHeader_t* GetHeader() const
+		{
+			return reinterpret_cast<Miles::BankHeader_t*>(fileData);
+		}
+
+		const char* GetBankName() const
+		{
+			return GetHeader()->GetBankName();
+		}
 	};
+
+	static_assert(sizeof(Bank) == 0x20);
 }
\ No newline at end of file