I didn't build my own.
I reclaimed my son’s bedroom when he went to college to use for my airplane workshop and since it is in the house I had to make a pretty good effort to control the dust.
I have the Delta dust collector along with the Delta downdraft table and I am very happy with it. It is fairly noisy but of course it only runs when sanding operations are underway.
It works good enough that I can use a bench top belt sander sitting on the downdraft table.
There is also an old squirrel cage fan I got from a surplus equipment rack that I have put a furnace filter on and it sits on my workbench, it runs whenever I am working on anything, it collects its fair share of dust too.