I have been welding my roof on my 1929 ford, I have been spot welding the roof and I was wondering how much of a gap can be left between the welds... now the biggest gap is about 1/8 of an inch... can I start grinding the welds or is more needed?? one other question with the visor should I slide that under the front of the roof and then weld the roof down onto it? of course I need to cut an bend the ribs down to match the back but any suggestions on how to fit it would be appriciated...

thanks,
simon