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I'm not sure you could land on the sea with those skids. I'm guessing it would do a ground (water?) loop as soon as it hit a wave top.
it would be fine. Just watch the new America's Cup boats tack back and forth off each hydrofoil. Or watch water ski vids
I think also this one would have benefited from jet engines integrated into the wings. It had a problem of overheating which hurt the power which hurt the speed.
The Continental XIV-1430 engines were a failure, as they were in the only other aircraft that used them, the Lockheed XP-49. McDonnell wanted to replace them with Allisons or Merlins, but the USAAF wouldn't let them.
Republic XF-12 Rainbow https://www.militaryfactory.com/aircraft/detail.asp?aircraft_id=681 Image Unavailable, Please Login Image Unavailable, Please Login