How can anyone answer that without knowing what you are intending to cut with the machine.? . . . Also 40 x ? profile will be very hard to find. .

Now if this helps, the L shaped gantry design is simple and it's strong for the type of machine I designed it for originally, which was a small Strong wood router (6090). However, it's also been used on larger heavier duty machines for cutting Aluminum, etc so it's well-proven.
To me the little extra it costs and the flexibility it gives along with strength make it worth using no matter what machine. But you could say I'm a little biased, but you could also say "He's built shit loads of machines using it and everyone is happy so it must work well" . . . Or not.!