This is 17 feet, who would take the chance?
Stay safe , plenty to do in a small rib close to shore or get a bigger boat if you have the desire to go to Rotto.
4 yrs ago we went to rotto, booked a mooring , quick calm trip over , forecast, light offshore, cooked a bbq for tea, had a few beers good nights sleep, Until 4 in the morning . The forecast was way out

, the wind (easterly) was a howling 30knts +, we waited until 10am and it didn't drop , it got worse, so we decided to head back to Rockingham, in a 6mtr ali , we hit a top speed of 10knts, misses had lifejacket on for the first time ever, one hell of a return .
Don't take risks on the water you will only do it once!!