Parallax wrote:
Being almost finished with Minicup #2 has me wondering what to do next
(besides work) in evenings. ....What I need is a seriously
lightweight collapsible dinghy.

Why reinvent the wheel?

http://geodesicairoliteboats.com/

I don't see why you need to make a collapsible one, but you could do it
by cutting any conventional boat in half and transoming the two halves.
Exercise a little cleverness and you could have a nice Whitehall that
would still fit on your foredeck, and each section could be lifted with
one hand.

Personally I don't want a folding or collapsible dink, and so am
seriously considering carbon fiber. It's expesnive, but there's really
no substitute if strong & light are the design goals.

Fresh Breezes- Doug King