If you know anybody that has a plug in the wall arc welder one of these can be put together with steel stock from Lowe's or Home Depot in about 30 minutes. They are very cheap and easy to DIY but if you have to pay a steel fabricator he is going to charge a fortune like $800+ If you do have to use a fabricator check out all the rod iron fence places in your areas, send them that picture and get multiple quotes. Personally I would invest in a small $100 AC arc welder, buy some steel stock and use the tutorial CD to practice basic welding. In about an hour you'll be ready to fabricate with just the welder, a hack saw, and a tape measure. Then you'll be ready to open your own custom steel aquarium stand shop.
I have a welder just for these kind of little projects and it has saved me a fortune. If you lived in town I show you how to make it free.
Also since you live in LA you can go to TJ and have one made custom also for about $100. Before I learned arc welding and lived in San Diego, I always went to TJ for custom welding stuff and body work.