The casing is the part of a room display project nobody researches and everybody regrets. The tablet gets a spreadsheet and three rounds of comparison. The software gets a trial and a security review. The casing gets ordered on the Thursday before installation, from whichever supplier came up first, because it is just a plastic case. Then it arrives and the charging port is in the wrong place. Or it fits last year's model of the tablet you bought. Or it is one moulded piece,