The cheapest 5 axis machine I'm aware of is the ShopBot, and it's $40,000.i dont mind spending extra money for a good build, but I cannot simply afford to pay for a commercial machine that cost over 10 000$
Honestly, I don't think you can build a 5 axis machine yourself for under $10,000. And if you don't really know what you're doing, you'll end up with $10,000 worth of parts that don't work.
I think you'd be far better off to start with a 3 axis machine, and when you get really good with it, then you can think about a 5 axis.
In the 8 years this forum has been here, I've seen maybe five 5 axis machines built. And even fewer actually running.