Ben, Yes I've had a plastic kayak in the past, but weighed less in those days. I couldn't even legally fly that sailplane with my instructor now. I'm going ahead with building the Vardo. I laid out the frames last night and will start cutting them out tonight. If I don't fit in the Vardo, I'll either make some adjustments, or wait until I do, but I've since seen pictures of people in their Vardos, and I'm now confident that I'll fit.
Mark