Agree on looking at monos. When you compare apples to apples in effective size (40-45 cat = 55 foot mono approximately) and price range there are a lot more options on used market in monos with live aboard comfort.
In essence look at some 50-60 foot monos that cost the same as a 40-45 cat and you’ll see pretty nice liveability and likely less upfront costs
Get job. Vote Republican to cut taxes. Save money. Buy boat. Fix stuff. Then cruise. Then fix more stuff. Then sell boat. Then buy boat. Then repeat. Then retire. Then vote Democratic to get free stuff.