from what I heard from pinfest last year as there was 2 there, that did not have them on public play because of the fear of over heating and parts failure as parts are very hard to find.

That's exactly right. It is why a few people at Pinfest twisted my arm and convinved me to re-create the full board set for these machines.

The MPU is finished and we are closing in on all the other boards pretty quickly now.

It takes a fair while from the "ïdea" of making a large board to actually having one for sale - let alone a full set of four boards.

They all bring their own challenges with modifications, parts substitutions and parts procuring before the final design is settled on.

Once these boards are ready there should be no reason for any Hankin machine to be unreliable.