Nice work at cylinders from bar stock of aluminium, but not cheap in electric consumption for home machinist, price of material before create to a product, an a lot hours of working.
There are two thing to think if the engine is used in the model airplane:
1. Cylinder made of aluminium bar stock is more strong against crash.
2. Cast cylinder of aluminium is brittle and knock off if crashed.
To be honest, i never seen the model airplane with Morton M5.
Jens Eirik, Bergen in Norway :)