Hi Graham, looks like you've got a bit of work cut out for you. I am also attaching my pier down to a concrete slab but I'm building a false floor so I can walk around the pier without disturbingi t and I can set the height to maximise my horizon limits.
You probably don't want to see too much below 30 Degrees due to atmospheric distortion but the SCP for me is at 37, yours about 40+ I guess without consulting the maps.
Looks like you'll have darker skies as well than my Auckland so take advantage of whatever you can for viewing.
Keep us posted and if you need any advice or help etc there are plenty of people on here who will offer you their assistance, even if it just moral support.
