Quote from: AdeVAs a PS... I've been thinking of this more as a challenge than a competition... although there would be some judging & winner(s): But I'd like to think that we can come up with something where the taking part is more rewarding than the actual winning... Is that even possible? I don't know... but here's hoping! 
Ade
It occurs to me that we can beak this down into two separate parts.
The Challenge would be to design something revolutionary, innovative, creative or even wild; based on a simple (wide open to interpretation) design requirement such as "Beam engine with double acting cylinder". This would allow our creative juices to flow and should generate some amusing entries/ contributions.
The Competition would be to make a good looking working version, based on the same simple design requirement.
Personally, I would enjoy having a go at the above design Challenge but not the making part. I do not have any manual machines in the workshop and not made an air/ steam engine in the last 40+ years. I also echo AVTUR's thoughts; I would prefer to use my workshop time on my main projects.
Agreed, a lifetime membership of MEM would be a suitable reward
Happy Christmas
Mike