You can't weld ALUMINUM to STEEL.... so those suggestions are just a matter of not reading the information given.
Like most of this stuff.... it all "depends". Depends on your goal - budget - skill - tools - time - and the end result of what YOU are trying to do. A build with a high budget wouldn't think about using something like this.... but my brother in law had something similar made out of steel sheet - painted to match his body color - and had won many local show trophies. His was not only a heavier gauge - but was relatively well done.
During this latest "re-do" we discarded that piece and used the DSE version and normal welded plug and bondo method to smooth his firewall -- and it's no question that this method is more "professional" and nicer looking.... but the other method served him well for 6 or 7 years.... so it's just a personal choice.
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