Hello. I know this is an old thread, but I hate to see misinformation spread.
That's actually not a Nissan Cube. It's a Suzuki Lapin. See for yourself, compare the sides of these vehicles with the one on this page. The green car even retains the stock mirror.https://en.wikipedia.org/wiki/Suzuki_Lapin
It's a shame that it's NOT a Cube, this thing is pretty cool and I wouldn't mind building one. Unfortunately, the Lapin (and its twin, the Mazda Spiano) is a kei car sold only in Japan, meaning anyone interested in these kits in the USA will have to wait another ten years for the donor to become eligible for import. You're good to go if you live in Canada, though.