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In the same respect, natural design is being applied to everything. If man was simply designed by nature then would it be reasonable to say that everything man designs is a natural occurrence?

If man was simply designed by nature then would it be reasonable to say that everything man designs is a natural occurrence?

Sure, why not? Otherwise we have the environmentalists's version of Man=Bad and Nature=Good.

At least they are not supernatural. From this point of view one can consider them to be natural occurrences. Of course in this case an intelligent agent is involved (space aliens, humans or weaverbirds).

But one always has to take into consideration that something can happen without an intervening agent from outside. Sure, it's hard to imagine how a house or even a computer as we know it today could have evolved without the "help" from humans but these entities are not self-replicators.

Evolution is what happens to imperfect self-replicators in a restrictive environment. As far as I know every organism is a self-replicating entity (either through cloning or sexual reproduction) so an explanation that needs an intervening agent from outside isn't necessary.