I'm fairly new to cake decorating, but I like to be adventurous. My FIL's birthday is coming up and I'd love to make him a Weber Grill cake. http://weber.com/grills/?glid=5&mid=21 is the one he has.

I'm a little lost on how to do the supports and contruction. Any help or ideas would be much appreciated!

Use the search feature here and type in "grills" and you will get tons of pics, plus some threads on it as well.
Quite a few great ones have been done and you will get a ton of ideas.
Good luck!

Here's some pics of "flat" grills:

http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1232643

http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=680423

IF your goal is to do a 3-d standup. I'd make the grill from a two cakes baked in a bowl. The legs would almost need to be heavy wooden dowels, glued into place at the right angle and i'd say your base would be wooden and part of the equation. All painted black with a smaller wooden base on top of the legs. This smaller board would hold your grill/lid. I'd definitely do final assembly at the location. Then add grass to the base.

You could also pm Doug who is the technical cake guy here. He may be able to give a better idea.

Good luck.....sounds like a fun project.

D in az

aztomcat gave great links...good luck!