Panelin

Here is the first table with its panel in. The rubber hammer is very useful for taping the parts together here. Even on the first fit it seems to be fine. I don't glue the panel planks together, because they need to float independently to avoid the problem of cracking up when they shrink with the changes in humidity. I will chamfer all the edges of the joints as well. I do recommend gluing the splines into one of the grooves they engage with. If they are loose, the guide bearing on the router bit tends to slip in and cause a little divot in the edge.
The tape holds all the planks together well enough to rout around the edge. I clamp the panel on a corner of the bench, which means I can get right round the circumference with one change over. Dust equipment coming in handy sanding out discrepancies in the joints. If you click on the photo you might be able to see how well the router sticks to the pencil line thanks to the double blade cutter knife technique. You can see the pencil line on the part that is just this side of the clamp. In case you have no idea what the router bit might look like or indeed the finished joint, both are in this picture too. One corner of the table frame standing up in the bottom right corner has a groove cut in it. The tongue sticking out on the corner of the panel shown will be neatly housed in there leaving the surface of the panel and the frame roughly flush with each other.