Sl r230 radio

Hey people so I bought myself a r230 Bj 2003, I’m also totally satisfied, all extras are in there except for the problem with the radio which pulls down the whole car in my opinion. I have one of these cassettes built in believe audio cc10 or so… even worse no aux connection in the glove compartment and no cd changer. Quite a pity because otherwise the car is a dream, a previous owner 90 thousand down and top maintained… what solutions could I make now and at what cost point? Another small thing would be that the car opens the trunk electrically only from the inside with key nothing moves?