Thanks for the link there. I had a look for similar things after seeing that, but in the end because it's connected to more of a building, we were able to use long bolts that go through the wall to keep it in place.
The iron tripod, lol. It's built using triangles for strength, and will be bolted into the concrete. This may be replaced with a pier but it'll be interesting to see how it goes:
http://img.acianetmedia.com/i/riW0K.jpg
My solar filter so far. Bit messy looking, but holds firmly onto the scope even without being taped down (but of course I tape it down anyways) Basically I'm going to make a second hole for Baader Astro Film. The current film there is similar but lets a yellow / orange color through. I'll have covers for each film, so I can use either one at a time.
http://img.acianetmedia.com/i/0ni78.jpg
The bolt shown below will stop people opening the roof from outside. There's also long bolts going into the rest of the shed further down, which will stop the roof from blowing off in heavy wind:
http://img.acianetmedia.com/i/mJf4g.jpg
There's a door here, which just needs a padlock now:
http://img.acianetmedia.com/i/Nlne7.jpg