That Millyard fellow certainly is top drawer. Starting making an engine from scratch is relatively easy, as one has control over all the dimensions / materials etc. But in effectively joining two together, one is severely constrained. How do you weld two halves together with zero distortion? And aren't there areas that should be joined but which are inaccessible to welding? What about trying to fit two conrods on a journal designed for one - or does one adopt the principle used on radial engines (ie a master and slave rod). And what about the gear train - which will now be subjected to around twice the power? Will it stand up, will the gearbox stay together or attempt to represent a Mills bomb????
Rather him than me. And, as TT remarks, when completed his work looks as if it were factory produced.
