I did something more extreme to a 64 Impala we built.
I welded ALL the seems and panels.
In the end its like a vette. No seems except for actual door openings.
We welded the fenders to the rockers. The fenders and fender extentions. The front valance to the fenders. The fenders to the cowl. The rockers to the rear quarters. The quarters to the rear valance etc etc.
Bad pic, but try to look close.