Yeh i've drawn some marks on the ground now (in chalk) for where the feet of the platform sit, so it's much quicker and easier to get it aligned and start taking some avi's. I'm sure the rain will wash the chalk off soon, so i'll have to get a more permanent method, in different areas of the yard too because I can't image everything from the one spot
The shadow transits are a great site to see, visually.