A "recycled" eco-house?

Since playing with Lego at the aged of 4, all I ever wanted to do was build my own house. (This even led to me endeavouring to become an architect before my career took a mysterious turn towards accounting.) Having sold our family home & moving to a slice of paradise with a derelict old house, I have the exhilarating (and sometimes scary) opportunity of living my dream.
Severe budget constraints & an ever-increasing eco-awareness are resulting in quite an interesting architectural experience.
The first unusual development occurred when we were notified of the cancellation of our finance (FNB & ABSA both revoked all unused flexi-bonds when the global financial crisis hit.) Where we had previously planned on using elegant eco-architecture & alternative technologies, our options radically shifted to tyres, containers & recycled goods!
Hence, my latest project: converting an old shipping container into a playroom/guestroom. Insulation promises to be quite a challenge, since metal boxes are not designed for comfortable habitation! We'll be installing a set of recycled French doors & windows for ventilation & are planning 3 layers of insulation between the metal and the internal cladding as well as a living roof (i.e. a lawn on the top). Which of course brings us to challenge no. 2: waterproofing.
We plan to solve this one by rubberizing the top of the container, using plastic sheeting & creating drainage.
I found an old public swimming pool ladder for getting to the top & I can't wait to appreciate the stars in their full glory from the top of the container...
***
After 2 months of re-application procedures, we've regained our finance and our eco-house is back on track. Schedule has been abandoned, I have a renewed passion for reclaiming recycled materials & a very interesting guest wing in the making!
(photo's to follow soon)