You are correct. Damnit... :-)
Not sure I need one anyway - I may even have enough clearance under the two small drawers for a small "make a sanga" sized slide-out. Will see.
I have just ordered the draw and fridge runners and catches etc. All up $400. But they are good quality stuff from IRS. Could probably have saved a few $ on eBay...
If it works out and people like the result I might make the cut-list and CNC DXF files available for a small fee (to buy beer for my mate that draw them!). That way peeps can DIY their own set!