This planer is a centerpiece of my workshop. It is a variation of several plans I’ve seen for router planers (I went through several iterations of design before settling on this one as the best of the lot I had come up with). Most of the planers I used as my inspiration were for smoothing rough lumber. In my case, I needed something that was height adjustable because I work on slabs that are much thicker than rough cut lumber and on table bases that need to have top and bottom be parallel (I tried the chain saw, grinder, sander method and found I’m about as inept as I can possibly be at getting a really good, level surface doing it that way). So I came up with a configuration I’m really happy with. It includes the piping shown (all of which are available at your local hardware store). The stop collars allow me to micro-adjust the height of the rails so I can accommodate any piece up to 36” in height. I’ve done some sofa and coffee table bases with really good results. The angle iron I used for the sled provides a track in which the router moves back and forth rather than attaching the router to a sled where the whole apparatus moves. My sled runs on the rails very nicely and gives me a lot of control when making passes over the piece I’m working on. I’ve taken a 13” thick piece down to a thickness of 6” (second photo) flat on both sides. This piece will eventually become a wine rack for another one of our sons. I really need to be patient when planing a really thick piece as the depth of cut is very limited on each pass I take off. But, the best part of all of this planer is that it was really cheap to make. The only cost was the piping and the flanges they mount to. The rest of the materials I already had on hand. When I’m done routing, the table comes apart easily for storage, so takes up very little room in my shop.