I made so many modifications (deep in the engine, rebuilt it)... Like hundred of scripts modified and settings changed. I couldn't make a listing of all my modifications, it would takes ages to write/read and will be like pages on the forum. My module is a module... because it's REALLY different than the base module, the engine is heavily modified (the scripts that are not linked in the project settings).
Also, the 4.5 and the 4.1.5 are SOOOO different. It's not possible to apply my modifications on a 4.5.