Quoted from Outsidedge:

Hi All,
A quick update.... I am awaiting a few parts to test. We really need to verify one more attribute for durability before we proceed. Once this is complete either this week or next... I will be starting a new thread complete with a list of approved playfields we intend to produce. We already have a donor playfield promised for Future Spa, Wizard, (unofficially) Comet and "possibly" Flash Gordon... if we get 3rd party licensing from the I.P. owners. In total, I believe we have 31 approved titles with the intention of growing that list.
Stay tuned for more "Hardtop" announcements.