No missing parts. Top measures 3.16mm with my digital caliper, so 1/8\", or more than 3mm, thick, plenty for the size that it is but don't drop an anvil from a 2nd floor window onto it, probably wouldn't go well, or put too much heat into it, like from torch cutting/brazing or it might warp. Casters lock nice and solid. My Primeweld TIG225 did not fit on the shelf at provided height so I mounted it at the bottom by drilling a hole in each corner of the shelf that would fit right over the bolts coming up from the castors. Welder fits plus plenty of room to reach underneath to insert F clamps, etc. My only complaint is they could have includes washers instead of just using bolts with a nut to put it all together.