Merry Fisher 795 Series 1 Bow thruster tunnel diameter

[tim01]

I am just purchasing a Merry Fisher 795 series 1 2019 model and want to fit a bow thruster. Does anyone know the diameter of the factory installed bow thruster tunnel? The boat is in the water and coming from 2000km away. Also I would like a key fob remote for the thruster. Does anyone have recommendations for best brands for the job and any other advice? Thanks Tim