UKPassats

Hi gents ! Ive bought this b6 passat a few weeks ago, on the whole a nice car few scrapes here n there the wheels are quite poor from day to day life. I have few questions. Since its got 2 electric windows which is quite annoying can i convert the two in the back to electricity powered as well because the handles are really pissing me off. Second thing i want to put the rns 510 nav is it plug & play or more complicated ? And one more thing the back drivers indicatior has a few LEDs that had gone off are those replaceable or i need the full tail light ?
few photos of it