Here are the links to the lists of parts

My "Creative Decisions" are.....

Part 47996 has been bought in Black and sprayed Grey

Part 50990pb03 has been replaced with a plain Grey 50990

Part 298co5 has been replaced with Black/Grey 298c02

Part 32555 has been bought in Black to save money

Part 3703 has been bought in Black to save money

There are one or two others as well but those are the main choices made......

EDIT: I did not bother with the stickers, cert, manual or figures, I went for the cheaper versions of the "alternate parts" and I removed the pieces needed to make the name-plate sticker stand. A pdf of the manual is available online from Lego