The design on Codder's link was built based on a hang glider so it would be possible to land without it getting wet allowing it to take off again. It would be interesting to see this creation landing on water equipped with a paragliding canopy as it would collapse and go in the water leaving the pilot to gather in (30 square metres plus) soaking wet fabric, motor back to dry land (without the canopy getting sucked into the prop) and then dry out until ready for the next flight.
The concept seems ok (despite the practicalities of landing), I have had several hundreds of hours flying paragliders with and without a paramotor (and trike undercarriage) over the last 15 years and can vouch for the activity being less risky than most people would believe but landing in water is a real headache. I just can't get my head around this one.
I wouldn't trust them to make an 'A' frame let alone and airframe ! The welds would not pass a visual exam, I doubt they would stand up to stress.
A freaky alternative can be seen here:
To the future prospective owner - 'Happy landings'......R.I.P.