The Sportster tank was never baffled as far as I know.
Adding a swirl pot is a pita and adds a lot to the complexity (I should know...).
Best option is what Patrick did. You have a small hole in the bottom of the tank at its lowest point. Under that you make a small sump like feature (I think Patrick used a cone shape) which feeds the fuel pump. The small hole in the bottom of the tank allows the fuel into the sump - but not back the other way (unless you drive upside down...). No need to cut into and baffle the tank so much, much simpler.
Cheers, Robin
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