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Hi,
That's right about the bowing. I'm told its to do with the heat, that's why they have small welds spaced out.
Meru, one other thing you need to consider is that although the FL you're imaging at is fairly long, you are using an OAG which will see any flexure, be it on the mount or pier and correct.
Moreover, seeing and turbulent air will cause your star to jump around a lot more than the stepper or load inertia would make it jump. just zoom into to the guide star and keep exposures at 100ms and you'll see the star jumping around, but that's just seeing.
So I wouldn't over Engineer, rather make practical compromises if required but ensuring you stay within your target parameters.
As for the rat cage, yep with numbers its not ideal, but in practise, i'd be interested to see flex caused by the 4 x M12 or M16 bolts for a load of the EQ6 and an RC8.
It helps to have a levelled base for the mount to start with, so handy to be able to adjust.
Cheers
Alistair
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