Jazz is right on this very much so. My table is totally welded and it turned out fine? well not true, even with all the care in the world the bed still needed a lot taken off the surface to get a straight bed. In most cases that is fine but if i had used bolts i could have adjusted a lot of that out before surfacing. Just to add a bit more to the design try and include adjustable feet, can make a world of different to noise as well as helping adjust to unleveled floors. It aso makes it much easier if you ever needed to move it as well.