Yes, there are a few spot welds on the narrow bed. I know for sure that the plate that covers the rear support channel, (it also supports the rear of the bed wood) is spot welded to the support channel along it's length.
I'm pretty sure there are a few other places where there were originally spot welds, I can take a look this weekend.
Sorry for the blurry photo, but you can still see where the spot welds were located on part of that area, those spots freshly ground off. You can also see the remnants of the wood member that was in that channel.
-DAN