A:AnswerApple's smart covers have always just covered the screen side. Options that covered both sides are often called pouches or folios by Apple. Unfortunately I do not think that Apple makes a folio or pouch for the mini. However there are many other companies who make such things.
A:AnswerHere are dimensions provided by Apple at their support site -
Mini 2
Height: 7.87 inches (200 mm)
Width: 5.3 inches (134.7 mm)
Depth: 0.29 inch (7.5 mm)
Mini 4
Height: 8.0 inches (203.2 mm)
Width: 5.3 inches (134.8 mm)
Depth: 0.24 inch (6.1 mm)
A:AnswerI know this did fit my iPad mini, I did not opt for buying the pencil. That was a cost I couldn’t justify buying due to the fact I needed my iPad for fun, not for work. Additional accessories for the mini... I’m not sure. I’m sorry.