Observatory Build

Ok, so i finally decided to bite the bullet and build my own observatory. I had a good look around at what was available and although there are some impressive off the shelf items out there they were all rather expensive and didnt have the functionality i wanted for the price they were asking. So i got out a pen and paper and started to design my own.
Now a lot of you out there who have observatories have either gone for one of these off the shelf premade domes or gone for the roll off roof option offered by a few builders, well i have decided to go for something a little different and have designed a complete roll off observatory!
There were several considerations for my plan but mostly space and functionality. Living in Scotland it is rather cold as im sure you all know which was the main reason i didnt want to go for something like the SkyShed Pod as it leaves one just a little too exposed to the elements. I was also a little limited on space so a roll off roof was also becoming a bit of an issue as to have a warm room meant having, not only space for the telescope which had to be covered but also a separate work room and space somewhere for the roof to be moved to, that together with the fact that the wind here is rather ferocious sometimes, reaching in excess of 100 mph i was too worried about a wooden construction being blown away.
So, thats when i came up with the idea of designing a rolling shed observatory! This way i minimise my footprint by effectively storing my telescope in the warm room when not in use and when i want to gaze upon the wonders of our universe i simply unsecure the shed, open the doors and roll it back to have the telescope ready for use and my warm room right there waiting for me.
The first obstacle i faced was the ground itself; the only available spot i had to put it for the least unobstructed views was a little uneven to say the least and even in places not quite wide enough. Thankfully i had a mini digger available to me which made the job much easier. You can see below a picture of the ground after the initial levelling.

As you can see the site had to be dug out the side of the hill and was not quite wide enough in parts (sorry about the hand in the picture here but i was trying to block out the sun, the only day so far it did not rain!)
Once level i had to mark out the site and dig my foundations: as it is not a building of any great weight the main concrete pour will be sufficient to anchor the building and i will not need traditional foundations, only thicker areas of concrete where i plan to fit the tie down bolts which will stop the concrete cracking when i  fit them later. The only main foundation i have is for the pier which i dug out to 3 feet and used a large plastic barrel as the former for the foundation to hold the shape, size and position as i back filled around it and packed it in with an earth compactor  (i will be keeping my pier foundation separate from my main base pour so as to reduce the chance of any vibration effection my mount when i start imaging). Below i have pictures of the basic site layout and of the pier foundation former sunk into the gorund. It was far from a pleasant day for it but i perciviered nont the less.