We're looking at a 1969 Firebird 350, and after a scrutinous inspection we've found no real problems except the rusted floor. It's a good deal for the price we can get, but we're skeptical of having to weld in a new floor panel, seeing as they provide a large amount of support for unibody cars. We also have zero welding experience and no way of raising the car beyond a couple feet on jacks (which may not be safe without a floor panel). We can't go spending a couple thousand for a shop doing it. Is it something that could be done safely, or at all?