exterior bar/grill area materials

I just did an 12' x 24' outside covered kitchen / bar / dining area similar as you described.  The area was closed in on two sides with two walls at 90*. One wall was part of a 4' x 12 storage / toilet area.  It also included a roof / sun deck with an attached 16' x 36' pergola living area.  The metal stairs were a U & L shape with Ipe treads and landings.

I used metal studs/track for cabinet framing with cement backer and stucco finish for a little more formal look.  We used quary tile for the counter tops over triple layer of cement board to get the edge look we wanted.  All of the items you mentioned should be fine.  It just depends on the look you want.

Just make sure you keep the metal for the toe kick etc. off  the concrete floor and protected from moisture.  The light gage metal will rust out fairly quickly if exsposed to moisture.  It was a real pain framing with metal to fit in all of the built in equipment.

Our appliances:  Custom made stucco finished hood/exhaust fan(required to keep smoke build up from under roof)  36" Lynx grill/rotisserie, warming drawer, clean up sink, bar sink and ice & bottle caddy.  And finally 50" exterior flat screen TV recessed behind an overhead secruity door.

There is much more detail I could describe but would be to much to write or read.  I would love to include some pictures, but I don't have a clue how to do it. Heck, I still do my designs and plans with pencil and paper.  Good luck and have fun with your project.