Ill start off with these carbon TwoScreens:
Walls that can be used:
Icons: Smallgreys2, Smallwhites or SmallLight icons.
Use Apex Launcher. Nova, Adw and GoLauncher all crops the walls different. So each custom wall has to be altered if using another launcher.
Set the columns and rows to your liking. Maybe start by 7x7.
Transparent widgets can be changed to liking.