Hi! Could a wooden large arch be added?

Also wondering if there is a reason as to why the medieval door has white corners now but before the door was just 1 color? Not sure if intentional and if it is then is there a way to have it be 1 color only( or one color but the hinges and handle be what they are) Also if the medieval door could be made into a 2 wide door at some point? That would be amazing.