Here is a (non completed) project as design example...
> Working AlphaBmp + VCL (> only "Next, Back, Cancel, Finish, Music" custom buttons, ...)
> Working VCL Style + Custom LanguageBox (black style - music, click sounds, splashscreen too)
When you have the time, you can finish the script for yourself...
I found a small guide for converting BMP on the internet, attached as a TXT file.