Hey Everyone.
I'm part of a team of engineering students from the university of Western Australia. We're working with Dreamfit to design and produce land yachts for people with disabilities.
We're constructing two land yachts, one that is usable for a paraplegic, and one for quadriplegics. Both will be two seaters. We have only ten weeks to build them and a tight budget, but we'll have professionals and industry experts to help us with construction and design.

For landsailing expertise, we come to you.

The wealth of information on this forum has been of invaluable help to us already. I was hoping you could share your experiences to help us a little further.
To begin with, rather than reinventing the wheel we'd like to modify an existing design, although our budget requires us to build it from scratch. So if any of you have plans or blueprints (even of one-seaters), we'd greatly appreciate it if you shared them. Also any design quirks or notable innovations you've noticed from existing land yachts.
Other than that, we'd appreciate any advice, suggestions, encouragement, cautionary tales, or anything you think could be valuable or helpful.

Thanks a million in advance, and thanks for the great info you've already provided.