Yes, that's another possibility, use PHD2 on the Pi. I read somewhere using the internal guider is better as its more integrated with the other modules. Having said that I don't know what you lose using PHD2. I would have slight reservations about co-ordination.. After a Meridian flip will imaging wait until PHD2 has started guiding. Will guiding not start until Dome has finished moving. If a band of cloud passes and guiding is lost for a period will capture know this and halt imaging as well for a while. Is it necessary to re-align (plate solve) or does PHD2 put telescope back onto the target. Does a guiding fallure put the mount to tracking rate until guiding resumes? Lots of checks to be done.

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