I suggest contacting Zodiac
for an authorized repair facility in your area. These people will have the materials and training to repair the floor. Any DIY
attempt is likely to fail and also make a proper repair more difficult or impossible.
You probably have a different model dinghy
than me and probably live too far away but I have a Zodiac dinghy
with a fine floor and tubes but a rotted beyond repair transom. I'm not buying
any more Zodiacs.