I'm not an interior designer but I do a lot of restaurants and institutions.
I was looking around the link that jocontreras provided (thanks, btw, not quite what I was looking for but as it happens there is an object in that set I need) and there is another object in there that looks to be as close to what I was hoping for as possible.
http://www.objectsonline.com/product_info.php?products_id=1353
It's a parametric steel sink that does most of what I was hoping for. @$17 I'm willing to give it a try.
All the work into designing a proper part and the fact that I don't know GDL scripting is why I started to ask if anyone had one or knew of one that was available. I can imagine this would be quite a bit of work and I'm really happy the linked object looks so promising.
Thanks for offering advice.