for the front and back sides of the machine:
print 2 each of e5s1-skirt-right_x2.stl and e5s1-skirt-left_x2.stl. They go on the front and rear of the machine.
for the left and right sides of the machine:
e5s1-skirt-power-switch_x1.stl was drawn to put the power plug / switch on the back of the left side of the machine and uses the same screws to self-tap the hole. They printed fine for self tapping without needing to use any heat on my mostly-well tuned machine but YMMV. You should also print 1 of the SK-310-Left_x1.stl file and 2 of the SK-310-Right_x2.stl file. If you want the power switch to be on the back right side of the machine just mirror the e5s1-skirt-power-switch_x1.stl file and print 2 and 1 of the left and right files instead of 1 and 2.
for the centers:
print either 4 of SK_CenterLogo_Inlay_x4.stl OR 4 of SK_Center_Logo_x4.stl depending on which you like the looks of.
For the corners:
print 4 of the SK_FT_38mm_x4.stl file.
The author remixed this model.
I drew up a modified skirt from the Mercury One.1 project since it's not compatible with the ender 5 S1 due to the different power switch and slightly narrower frame width than the Ender 5 Pro