I would say you can make them flat or up the maximum allowable profile thickness.

Look in the proposed rules on the AMA web site, I don't recall seeing anything about the drop tanks or bombs. The rules are clear about the profile nacelles and fuselage but not sure about the bombs and drop tanks attached to the wing.

The current set of rules are being replaced, so whatever is printed there will be replaced with the new rules if they are approved

Fred

They definitely wouldn't be downgraded.  When you build a profile scale ship it's understood the front view is going to be about dihedral, placement, and things such as that, but not thickness.  I just re-read the rules and stores and drop tanks are not mentioned, so I would interpret that as anything on the airplane would be subject to the thickness rules that apply to the fuse' and nacelles.  So I would agree with Paul's post on this point.
At least that's the way I would judge it.  It is really neat to see droppable stores and tanks represented if the full scale ship used them, I think it's a great touch.  Just my opinion.