frame and outer construction on a velomobile

Hi we have a tandem quad, but are finding it very difficult to create a
fully enclosed shell for(was thinking fabric, due to the weight, and
versatility to rollup/zip off certain sections depending on the
weather), have a look at some pics of it at 

www.steppebysteppe.com.au

 Its not really a standard velomobile.Since,we're having trouble
making a fairing for it at the moment(mainly creating the shape/
skeleton), has anyone done similar projects? Enclosing the quike itself
is not for speed, but rather just to protect us from the elements
(sun,wind,rain,snow etc), but it need to be aerodynamic enough from any
direction so as not to become a sail. I think the whole problem is the
size of it.....any ideas? Any suggestions of pics, or similar ones
you've built, i'm running out of ideas!

thanks

-roge
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