I built one Demon from a genuine Wooten Flite Line kit.
As was the custom at the time, I used a pacifier and just let the compartment protrude above and below the wing. I may look unstreamlined, but a lot of contests, including several World Championships have been won with that setup. In addition to most of the Texans, Richard Wilkins and the Outlaws ran paciifers with protruding compartments.
The advantage is that the pacifier has lower pressure than a tuning bladder and the needle value is not nearly as critical. There are lots of NVA's that work fine with a pacifier, but leak or don't adjsut right with a bladder. Pacifier compartments seem to fit between the spars a lot easier than either hard tanks or tubing bladders.