Nice models, good start and I like the concepts for the DS.
One thing I could suggest as an easier way (sort of) to present your models is using this website:https://www.3dvia.com/join?returnUrl=http://www.3dvia.com/dashboard&type=my_3dvia
Basicly you convert your models to 3ds. then upload to the site, It may change the look of your models (probably favourably due to the sites software rendering) and allows it to be examined in semi-realtime (fake shadows)
Just a suggestion, heres one of mine done with An8.http://www.3dvia.com/JoeTheWiltshire/models/5BFB005163754759