My parents have a large garden, and have been in talks with a developer about selling him the land if planning permission was granted. They were going to give the proceeds to us to help us buy a house (we rent at the moment, having sold our previous house at the height of the housing boom).
I've always wanted to build my own house and have spent several years reading up on it.
The developer drew up plans, etc but has gradually stopped responding to letters - my parents think he has probably gone bust. Planning has not yet been applied for, it would need to be done carefully as it's an 'area of landscaped significance' and a 'landscaped approach'. The house could however be hidden with trees, (it would have to be a bungalow) and I'm thinking could be earth sheltered on the road side (also extra insulation).
Anyway, it seems silly not to carry on where he has left it and at least give it a go to see if PP can be obtained. However then I would need to fund building the house, hence the idea of doing it for free (or at least very cheaply). My main idea at the moment involves getting people (plumbers, bricklayers etc) to help out in return for advertising, and as I do IT Support maybe trading some of my time for theirs.
I also want it to be a very green house, so looking at solar thermal, ground source heat pumps, etc etc.
Firstly - does anyone think this plan has any merit whatsoever or am I completely mental?

Secondly - Any ideas of novel building techniques that would save money/the environment would be very welcome. I'm looking at Beco Wallform, Straw Bale, etc etc. Also well aware of Ben Law's house and planning on buying the book soon.