Hi, I started building this today. I assembled the outer frame and it is not overly sturdy. I did it with 16 1-1/4" course thread pocket hole screws in the location from the plans. Before I invest too much more time and money I was hoping to find out if this is expected? Will adding the interior pieces and the 1/4" plywood to the back truly make this fully stable? I planned on building the Miter saw cart next, but I would not put a miter saw on this one as it is now.