Designing and making a boat is a time-intensive process. You’d probably have to go through several build iterations to get something good enough to trust in a rescue situation. There may also be expensive certifications required by law where you live. If there was an accident and someone died while using your inflatable, you’d potentially be at fault.
This is not a good idea. Better to just use what’s already on the market. DIY tinkering when your life is on the line is just a bad idea all around.
