[Flat6pac]

The original question was. Can it be done? My explanation was of the original question with what to watch for.
Not that I recommend that way of assembly, I ve build engines from completed sub assemblies, as in many of the pictures I’ve posted over the years. that’s the way I worked in auto production, body shop until retiring and played with my Porsche’s building motors.
But the answer still is, you can build an engine any way you want as long as you can get it together.
Bruce