One thing to be aware of is the amount of clearance between the end of the scope and the fork base - on an LX90 this is not a lot. With the DSLR attached, it's possible that the camera may crash into the fork base when the scope is pointing towards the vertical (assuming you're operating with the scope in alt-az mode). Adding more accessories into the image train, such as a focal reducer, will of course exacerbate the problem. IIRC there is a setting in the AutoStar handset where you can set a limit to prevent this kind of thing happening, though this might only apply when operating in polar mode (i.e. with a wedge).
Just do some manual slewing trials with your setup to see if this turns out to be a problem or not.