Thanks Robin, I wondered if it might be a 'standard' Marlin grill. I'm not convinced I will use it yet.
I have worked out that the width of the strip will have to be 50mm, 2mm thick makes sense. I roughly measured the periphery of the grill aperture, is needs about 1500mm, dammed inconvenient because that's too long to be cut off the width of a sheet. It would have to be two cuts across a sheet - 750mm.
Paul, thanks for the offer, but I need roughly 16" by 17½" but also, I want the pattern vertical.
My original plan was to use stainless 'U' section, I have found a supplier, but I need about £70 worth of the material, then I would need to fabricate the grill myself. It would be the business but at a great cost.
http://www.fhbrundle.co.uk/products/...54m_Gap_1_78mm
This morning I have finished the accelerator pedal, my Dremmel came in very handy to enlarge a fragile hole in the carburettor operating lever to accept the larger cable end of the Shimano cable. All in all a great result.