Thanks for the comments. The cross came from Hobby Lobby's clearance section, I paid less than $1 for it. Got a bunch of other stuff from clearance, more iron crosses, a great urn, angel statue, etc. I think I paid less than $7 for everything.
Yes the top does come off and the coffin will house a bucky in an antique off white / cream lace dress that I got at the local good will. I haven't decided if I am going to hinge the lid yet or not, I am waiting until the bucky is done and see how she fits into the coffin.