The integration of different resources on Aging appears to be pretty doable with a combination of AWS and/or vhost trickery.
The basic idea would be to host the Longevity Alliance associated site like Denigma as individual branches of the same physical website. They could then share a database (either co-located or virtual), Apache instance, etc. The in needs the DNA records need to point people browsing the site to the adequate branch: IP:8080/DENIGMA_BRANCH or IP:8080/LONGEVITY_ALLIANCE_BRANCH. Then it is possible to use VHOSTS (virtual hosts) to ensure that people visiting those pages see the appropriate domain in their browsers. It would also help to resolve SSL certification confusion it SSL support will be needed.