I seriously think there is a lot of money being aimed in the wrong direction here.
The telescopes under discussion namely Planewave DK and various RC's are imaging instruments and not the greatest for visual use, for a number of reasons based on the physics of their design.
The whole purpose is partly self defeating when one considers the prevailing sky conditions, making lunar, planetary and double stars the targets of choice. For these targets a scope like a 6" or 7" Maksutov housed in the dome would give far better visual lunar planetary views than these photographic instruments you are considering. I was in Sydney about 15 years ago one Friday night and I took my wife up there to show her the Observatory. I remember looking at Saturn through that 16" LX200, which was pretty new at the time and I can tell you the view was downright poor. I didn't announce to anyone that I actually knew what I was looking at and the view was very poor, because that would have just spoiled the enjoyment of those people who didn't know what they were looking at. My thoughts at the time, which I kept to myself and my wife were, "why did they waste all that money on this POS, when a 7" Mak would eat it on lunar/planetary views", which is all the location is really capable of supporting.
One far less costly option may be to consider a much smaller telescope housed in the dome for lunar/planetary views and then a compact large aperture dob for use in the grounds on DSO's. eg a 20"/F3.3 which adults could use without a ladder and kids would only need a small step stool to use. I can appreciate that the dome helps with light pollution but the light pollution is such that the view of DSO's is going to be poor wherever you set up the telescopes.
If you must have a big telescope in the dome you could also consider the
16" Parks HIT series. This is a 16" F4 newtonian with an F15 Classical Cassegrain focus. You would only be able to use the Cassegrain focus for reasons already stated, but this will be a far better visual instrument than the Dall Kirkhams and Ritchey Chretians you are considering. Their is no free lunch. Unfortunately being a 16"/F15 telescope with a 6 metre focal length even an eyepiece like a 55mm Televue Plossl will give 110X. A 41mm Panoptic, which is as wide a FOV as you could get, will give 146X at about .46 degrees.
Cheers,
John B