nice bike, any plans for building it? why aluminum, if you really want it to last for ever you should think chrome steel or 4130. Aluminum is strong but it does accumulate stress.
Aluminum is fine if you design it right. Mind you, aluminum isn't the metal to use if you want it to last a 'lifetime'. Titanium would be better than cromo, but would cost quite a bit more. Cromo is stupid heavy...strong...but not as strong as titanium.
Dude, I like the design and the skill with which you've turned it out on 3DS....!!! Damned thing looks wicked!! Churn out some more stuff if you have.....