I've made the decision to test the prototype in the first instance with the rotor-head locked in the uppermost FLIGHT position, and as a result I've been able to reduce the circular tubes to just 1050mm and need only drill the centre-section of the top end at 6mm instead of 20mm or thereabouts. Here I am allowing for the internal width of the alloy sections and positioning a bracket to match the bottom and middle sections of the air vehicle.
