OK, here's a couple of thumbnails.
First is a side view of one of the 2 main panels that make up one sawhorse. Adjust the size for your own needs. I'm thinking 1/2" plywood. The corners can be rounded to accommodate the jigsaw. Takes one sheet of plywood per sawhorse. The advantage is that these are quick and easy to build. Disadvantage is the cost of plywood. A light duty one might be thinner and a HD one might be thicker plywood. Don't be afraid to adjust the dimensions to suit your use. There is plenty of left over material to use for jigs and fixtures to put on top.
And don't think the dimensions shown are set in concrete. Maybe the 8" dimension could be 6" to make them lighter. And the suggested (But not shown) radius in the inside corner could be larger to make the corners stronger, like 3" or 4" or so.
The second view is a plan view. Looking down from above. You can see that the triangles are equilateral. This makes the notch cuts for the 2x4's easy as they are 30 degrees. It also gives a wide, stable base. But you could make it a more obtuse angle if you wanted. The plan view shows the points of the two bases put together. They could be connected to make the whole thing even more stable. But as separate bases, they could be lid even closer together to create a rectangle, or pulled apart for longer work pieces.
Notches for pipe could be incorporated in the base, as shown, or into the 2x's that set into the base. The 2x4's are replaceable as they get chewed up. Note that I have shown the notch for the 2x4 as being 8" from the end. It might need to be a little further for balance.
You could turn each base (Or both bases together) into a work table by adding a piece of plywood to the top.
Using hinges, these will fold fairly flat for storage.
Anyone have any other ideas?