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Many people have seen corrosion on aluminium masts and this makes them nervous about an aluminium structure, but masts are constructed from 6 series aluminium, which is less resistant to corrosion and they have an enormous number of stainless steel bits and wires attached to them usually with no attempt at isolation.
If you are sensible and careful with wiring a well constructed aluminium boat should not have any problems with corrosion. The 5 series of aluminium on its own is the most resistant material to seawater that is used in boatbuilding. Suspend some unpainted 5 series aluminium in salt water and come back in 100 years it will look the same and still be as strong as day 1 no other commonly used boat building material would pass this test. Problems can occur if the electrics or attachment of stainless steel is done incorrectly, but boat builders know the correct way to do things and if you own an aluminium boat you also need to know this.
Structural problems with fiberglass boats, such as core rot pose more problems.
Ovnis are great cruising boats if you want a shallow draft don’t be put off by the aluminium it is a major advantage.
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