If you want a funky roof on your mini, like the brilliantly chequered styles that the original Minis were so famed for, then you may have trouble with the online Mini car configuration. They make it difficult to have those extra special things when you are designing your dream Mini.
Instead, it may make sense to opt for buying a Used Mini, where the roofs are already decorated in that funky Mini style. You get to avoid the hassle of picking everything out bit by bit, but still end up with a cool looking car that is fun to drive.