<<That sounds like what I was planning for the al tubes.  SS tubes will be
left
as is.  What treatment, if any, should be done to the insides of the
aluminum
tubes?>>

Aren't all the tubes anodized when we get them?  That would imply that
unless you scratch through the anodize layer you shouldn't need to do
anything with them.  If one were worried about the control tubes, then what
about the hydraulic lines?  Does anyone go to the trouble to treat those?

Gary Casey
ES