I wish you all the luck in the world bud I was the first to say that your website looks great and I also know without a shadow of a doubt that you will and are making a success.
But yeah to me a builder is still am old skool bricklayer firstly.
Most good builder pairings is 1 bricklayer and 1 joiner. They take full ownership from footings to roof.
The only normal exception for them then is to get an electrician, plumber & sometimes a plasterer some times not depending on if bricky was taught it under trowel skills.