https://pontoonboattops.com/ has bimini frames. With a 150 you should go around 30. You can use your phone and mph app to see how fast it goes. To speed it up make sure toons do not have water in them. Bigger motor. Check the gauge manufacturer and check their site for bulbs. I use a separate...
I have a Sylvan 24' twin 25" tubes. It's rated for 150hp but came with a 90hp two stroke. I repowered this year to a Suzuki 115 and I go 22 mph at 6k RPM.