Well done Buffman! I will be following where possible yours and dlockers threads. I am yet to start mine. I've been debating a concrete slab myself. Not sure which way I'm going to go.
When I tell people I'm going to self build, the question that always comes back is, "oh really, wow, will it be loads cheaper than an of the shelf version then?" My response...errr... dunno. lol
I saw some insulated buildings for 5-10k, but some of these "insulated" buildings are 75mm total wall thickness, which seems meh.
What sort of budget are you realistically aiming to come in under?