Yes, making your own is quite possible, as stated above. A good sturdy table, non skid top and an adjustable arm will work fine to start. make sure all your supllies are neat and clean looking though. While you can have the fanciest of everything and be a bad groomer, or the shbbiest and be the best....first impressions are important.
If it looks clean an orderly then you turn out a great looking dog, you can count on return visits and word of mouth business.
As you start to see profit, invest little by little into better equipment (official grooming table (large) with adjustable arm, etc.
Even small touches such as bows in the hair of the long haired girls, bandanas on the boys, etc. Small cost but a cute addition to top of a nice groom.