Thanks. There will be a lot of rigging, but otherwise I'm not too worried about this build or its scale. WnW knows what they are doing.
Anyway, started from engines:
The engines are mostly hidden, but if one of them turns out to OK I'm planning to leave engine covers off from the one side. At least one will be covered to show how the plane would look normally. This would require spark plugs and wiring to one engine.