Add menus to kitchen unit and welding rig (Finally Ready!)

In my quest to make the RV kitchen unit and welding rig have all the same features as their portable counterparts, I'm trying to add the use_hotplate  and soldier_weld iuse menus to them.  As I don't actually know how to code, it's a disaster, errors out the wazoo.  I'm hoping if I try to put this together, people who actually know how to code will see it, laugh for a while at all the idiotic mistakes, and help me fix it.

EDIT - Thanks to the help (and endless patience of) Kevingranade and atomicdryad, this is complete and functional!  Tested and works, I think this really adds to the usefulness of the RV kitchen and welding rig, and it also gets rid of the annoying string of yes/no prompts the RV kitchen gave you, and replaces it with a neat, tidy menu selection instead.