When we first moved in to this house, we, too, had a small kitchen. So we purchased some Metro shelving and a Boos Block and put them together. The butcher block just rests on a cut up thin sanding pad placed on the top of each leg. But it's so heavy that it doesn't move around. From GardenWeb Photos Shelving like this is now available at the big box stores. Just be sure you get the heavy-duty variety if you are going to load it up. If you want shelving in something other than chrome (ours is a sort of graphite color), you can order it online, or go to a restaurant supply store. You could also put casters on the legs if you needed a mobile cart -- again, get the heavy duty ones. For ours, the shelving is 24" x 36"; the butcher block top is 30" x 36". But many other sizes are available. As you can see from the pix, this now backs up to small granite topped cabinet. But for 12 years, it was our only island. We love being able to prep/chop from any side.

New proposed layout. I did a mock up in in the IKEA home planner but it will most likely use a local cabinet company.

at 24 inches deep total...you could do something with 12 in overhang and open cab on sink side at 12 in deep .Dont discount the usefulness of that. Adding furniture feet and a matching interior and those cabinet shelves would be useful. and can look good in your space. the top surface at 24 in depth could add that workspace component. That leaves 80 in for your two aisles and if a stool is on both ends and only one stool on long side then that makes this feasible. You could curve the overhang gently and if only one seated person at widest depth and then curve back makes the aisle walkway a bit more kind. This is not drawers on kitchen side ..... but I still think from the pict I'd want something. the room does not appear as it was originally a kitchen.......have to work with it being a passage to your patio it appears. think about a stool each end and a third stool at the longer side and how that helps w measuring something out.

https://www.houzz.com/discussions/2699918/looking-for-layout-help-memorize-this-first