The best way to clamp these pieces is to use some cleats-screwed to the opposing apron sections and parallel to each other.
This allows a set of clamps to pull the joint tight.
I'll do one leg at a time untill it's set.
The first leg is not to complicated to get clamped up but even with the cleats, getting the second leg clamped up was next to putting a cat in a tub of cold water. If you try someting like this-it's helpful to get another set of hands.
After I managed to get the second leg clamped in position, I placed the other apron end and two legs loosely in place.
Gluing the legs to the apron.
Getting close to the end of this operation-gluing the other two legs in place. I'll add the end apron section in the final assembly.
Here is the last glue-up- which was almost a screw up as I had the assembly set up on a couple of boards over a garbage can.
I got the last apron piece all in place and clamped up and began congratulating my self when I realized the apron was clamped up side down. Fortunately the liquid hide glue I used for this table has a long open time and re-setting the apron wasn't a catastrophe.