The sheet metal lower cabinets are really flimsy. And even with the low one, it would place your shaper arm pretty high.
Bottom Tool Cabinets are usually very sturdy to take the weight of middle and top cabinets. The one I bought for my optical divider is rated for the usual 150 pounds per drawer plus 600 for the middle and top chests. The tall ones are also the right height for sliding heavy tools onto the mill table. The one I just got will be used to hold my optical divider and my 10" rotary table. I think another tool box like it would work well for the shaper and also allow me to hide it when not in use.
I can't weld worth shit so NO welded stands in my shop!
1" diameter larger wheels ?
I almost always get bigger wheels. The bigger diameter makes them roll easier and the extra height works better with my height.