No, they don't have corner sink cabinets, but there are several ways to get a corner sink. One is to use the corner wall cabinet as a base. Also, you don't go by what ikea lists. Everything at ikea is ala carte, so you use it like legos: combine different pieces from different cabinets to get what you need.

You really should sign up over at ikeafans. They'll get you sorted with the pieces you need in no time:

Here is a link that might be useful: ikeafans website

18" trash pullouts are from rev-a-shelf. rev-a-shelf has two measurements; what it's called, 21" double trash for instance, and what is the minimum sized opening. A 21" rev-a-shelf thing fits in a 21" framed cabinet but also sometimes in an 18" frameless cabinet and sometimes not. I'd advise being cautious and double-checking if in doubt.

The other easy "trash pullout" is just to get the high drawer that fits for the size cabinet and drill the back of a door for the drawer attachment brackets. Stick a store bought trash can in it.

Other 3rd party trash pullout units work just fine.

Instant cubbies are called expedit shelves. They have all manner of containers available separately that fit into the cubbies. Plus some drawer and door inserts. You can use it in just about any orientation. For instance, an expedit 72" tall unit with a single column of cubbies, laid on its side and a cushion on top is called "bench with 5 cubbies".

You can also look at the closet systems - PAX. They come in two depths and two widths. Fixed shelves at the top or bottom for cubbie space and some room for hanging clothes or hockey sticks. They can also have drawers and various attachments.