What's the difference between Interior and Exterior scaffolding?
You're really going to have to look at them up close &amp; personal if a simple 2x12 across 2 or more supports isn't to your liking. Interiors are either a fancy version of the 2x12 on empty 5-gallon buckets or self-standing &amp; rolling cages of quite short lengths.

Exterior usually is not self-standing &amp; must be anchored to the building, negating its use inside altogether, but they are made to receive additional sections &amp; levels.

If you haven't used ladders &amp; ladder jacks for exterior scaffolding you may want to try that out first &amp; they can be used indoors with the Werner type of adjustable ladders that can be used as step or straight ladders.