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Ok paint them then put them together or put them together then paint them? And if the latter how do you remove paint from a plastic model?

If you are painting the interiors do it in steps, paint the interior, assemble the interior, and then put the tanks together and then paint the exterior. If you paint the interiors prime everything prior to assembly. If there's no interior to paint, assemble, then prime and paint. And why would you want to remove the paint later?

If you have to remove paint from the plastic, there are several faq pages addressing that at any number of sites. My personal favorite paint removal substance is Castrol Superclean, but be careful using it, definitely read the precautions.

wont it damage the plastic?

No.  I have very good success with it in a 50/50 blend of Superclean and water.  Soak a couple of days, scrub and rinse.  Wear rubber gloves.