T&T: Aluminum Hulls and Surface Drives whats happening up north?

[J Rudolph]

On a recent trip to Alaska I noticed a lot of good looking aluminum 
fishing boats and some cruising boats.  What are the pro's and cons of
aluminum as a material.  I can think of a few cons besides 
electrolysis.  In colder climates I was wondering about condensation. 
Is this a problem behind headliners and paneling?

There are a couple builders that I know of who build Aluminum 
Catamarans and monohulls and they seem to be using surface drives in 
greater numbers. I am thinking this is because of the lightness of the 
aluminum platform can utilize the speed resulting from these types of 
drives.  I have never liked stern drives and have had mixed results 
with these in salt water.  Is the surface drive more robust and less 
vulnerable to electrolysis? or just for designs meant for maximum 
speed?  Just some thoughts that I was wondering what the listee's 
perspective might be
on Aluminum and surface drives.

John Rudolph
KK 48 NS
Kiapoko
Ventura CA