Hi Peter
Got the dome errected at the weekend, apart from a couple of cock ups (not reading the instructions) it was a doddle. The scope is installed just require a good night to get everything sorted. I would mention that I have the home model thats only 2.3mts and with the 12" there is stacks of room, you mention the 3.5mts unless you plan to put somthing bigger than a 10" it will be an overkill, spend your money on a decent CCD .
In regards to the pier you could swing a Mack Truck of it, I think some guys go a little OTT in regards to concrete densitys, ree bar diameter etc
Anyway have fun a will attempt to post some pictures later on.
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