I spent a fair bit of time on the phone today ordering the timber, timber fixings, excavator, and portable waste bin. In the final breakdown of costs was:
Timber / Concrete / Fixings
I'm pretty excited about the excavator, it's been a long time since I've got to play with a big mechanical toy like this. The waste bin is worrying me a little. Theoretically I should only be removing 3 cubic meters of soil from the site, so it should be OK.