I have been using a couple of poly hives for two years with a view to replacing my cedar nationals. Overall I have been very satisfied. But I have now replaced the flat plastic Qx (due to propolis and bee squashing) with ordinary wood-rimmed metal excluders with a bee-space. Thinking also that poly mesh floors are hardly needed (small mesh area, vape singe and snug-fitting varroa trays. Also minor rain leakage between boxes (vaseline is a faff). Has anyone else started to hybridise parts - or bought just poly boxes roofs?