I made a grill surround for my Cobra 289 replica which is a similar shape to the 250. I made it in brass strip, about 18swg. It was a fair bit of work to make the former but once that was done the metal work only took an hour or two. Had it plated and was quite happy with the final result. Same could be done in aluminium which would look nice polished up.
http://www.fantasyjunction.com/img/c...arge/41610.jpg