I can build speakers better than any factory. I have a woodshop with excellent tools. But I am slow and most of all plain lazy. I have a design degree too...it's a complete sin.
I can afford to buy them so I buy them. But I think you should build them. Go for it. You can always tweak and build on what you've learned the next time...and then just move the components into a better cabinet. Don't be afraid to find a cabinet maker to advise or even do parts of the more difficult procedures.