In an effort to represent all of the various power plants seen in the M4 Sherman, four of the kits in the book will have complete engine compartments. Unfortunately, many of the available aftermarket kits are for older kits and many of those are incomplete.
This is my basic M4A2 engine compartment. The grey parts are from the older TWS conversion kit for the Tamiya M4. The perforated areas (which are brass sheet) blend perfectly with the rest of the sidewalls.
The assemblies are designed to fit together without glue so that it can all be easily painted.