Timna is fascinating. I recommend visiting there but not in the summer.
I haven't been, but I took the cable car up to Masada in July, once. :melting:
That is what is missing. I have heard of the Saudi Arabian theory, but have not seen any really convincing evidence for that. I am not convinced that it matches the Biblical text well either. Maybe more information will show up some day.
If you're referring to Jabal al-Lawz (Cherub Ram has already linked an article), then there's not a lot of evidence, but there are enough similarities or coincidences to make one wonder.
For Arabia as a whole, I think it matches the Biblical record pretty well.
First, the Biblical record shows that Moses was originally taking the Israelites to Medina (Midian), which is in Arabia.
Second, if we accept that they went to Timna for all that Bronze work that is recorded, then we are admitting that they had already left the Sinai peninsula early on.
Third, look at where they re-entered Canaan. They came in from the East across from Jericho, not from the south, as would be expected if they had been in Sinai.
Fourth, the Biblical record seems to indicate that they were in an area with some vulcanism (e.g. fiery mountains, pillars of clouds, bitter springs). That could be anywhere within the Rift Valley (which includes both al-Lawz and Timna, along with the entire western coast of Arabia, the Jordan river valley, the Dead Sea, and historic Edom and Moab). I don't know of any vulcanism in Sinai, though.
Jarrod