Well took me 2.5 hrs to install the access roll cover! Had to remove all the inner panels in the box (3) had to bolt and mount the Z brackets supplied (6), drill some pilot holes in the panels then reinstall. Mounted the side rails and the front header rail had to be modified for it to bolt to the exsisting holes. the 1 hole was out on the header a bit so I opened it up for bolt alignment no biggy. Fit and finish on a scale of 10, 10 being perfect (9) I would like to see a little more thought in their design, The velcro sides are on an angle and that makes for a catch all , like snow and ice to freeze between the tarp and the box sides. Time will tell on that.The trunk opens up enough to stay up and that is acceptable for me, all in all Im quite pleased. I would say if you had a certain amount of mechanical knowledge its a no brainer just take your time and read the instructions well before drilling!!