Started my RPI 3B+ Build with a single unit for now with the intention of getting 5 running exclusively Seti..
Update 20/04/2019 Now running 4 Rpi 3B+'s
2 Running off powered usb hub (Red usb cables)
2 running off official Pi power supplies.
Acrylic case from Amazon:-
Jun_Electronic For Raspberry Pi 3 B+ Case 4 Layers Stackable Grey Acrylic Raspberry Pi Case with Fan and Heatsink
Got a stack of 16g Micro sdhc cards from My Memory (Come with a life time warranty, So we will see when the first one burns out)
Oh they do attract the dust lol...
UPDATE:- Dec 2019
Just purchased my first Rpi Base Plate 3 Model A+ and running nicely.