From what I can see from pics, you're missing the tank and regulator, and tool hooks and grate hook. In addition to the aforementioned thermo and ash sweeps. I also don't see the steel rod/hinge that holds the table in place. And it looks like 2 charcoal grates and no cooking grate...
The 5lb tanks with OPD are kind of hard to find, but since you need a regulator hose, you can get the new style from Weber (or Amazon or...) and convert to the 1lb bottles. There are a couple of mods here that show how it can be done.
For the frame, you can leave as is with the L-brackets , or look for info here on "star nuts" for a more inconspicuous fix.