Large autonomous RC boat

Does anyone have experience building large RC boats?
I need a semi-autonomous boat that can travel between 2 islands at a local marina.
I want it to be 6 ft by 4 ft and a catamaran design. Like this https://siamagazin.com/wp-content/uploads/2018/09/2g3g23-min.jpg , but smaller

I know this is a long shot but please get in contact if you have done similar RC boat projects.
In your bid be sure to show previous large scale RC boat projects

Similar size:
https://www.youtube.com/watch?v=WMYuNOVzGZQ
https://www.youtube.com/watch?v=IgSD35CzPbs
Autonomous example:
https://www.youtube.com/watch?v=HFhsh4V8SZA
https://www.youtube.com/watch?v=fH5AfD628rk
https://www.youtube.com/watch?v=P70vn8QD9wA


thanks