Today I detached primary and secondary mirrors and their cells from the tube and measured their parameters.
Minor axis of secondary is 66mm, that means I can use normal focuser and get reasonable field.
Weight of secondary and spider is 470 g, but perhaps, I will rework it.
Weight of sitall primary mirror and cell is 4.6 kg. Primary mirror is 260mm, 27 mm thick, focal length is about 1175 (F/4.5), cell is 6-point.