I am in process of restoration of an old good 1962 VW Beetle (1200 cc engine). There is plenty of body work to do, and that is exactly what i am dealing with at the moment. And it appears, that the firewall is rusty and of no good already. So I thought of the right way to work at these areas. I thought that I'll cut out the rusty areas and then will reinforce it by welding a new metal plate. Or it's better to do both sides? As I did not seem to find anything suitable locally, so what will you say about such way of fixing it?