How does a cross dispersed spectrum look like in a reality (from echelle spectrographs)?
You are doing it incorrectly if you are trying to cross-disperse your Fig.2. You should be cross-dispersing your Fig.1.
A &quot;cross-dispersed&quot; spectrum requires requires the dispersive elements to be at right angles.
Your Fig.1 shows the dispersed spectrum from the echelle with overlapping orders.
To separate the orders you view Fig.1 with the cross-dispersing element, but with the cross-disperser dispersion direction placed along the y-axis of your pictures. A schematic would be something like this, where the grating rulings are indicated with lines. (I believe this picture is originally from Optical Astronomical Spectroscopy, by C. R. Kitchin).

The slit orientation would be parallel to the rulings on the echelle, but you need to make the slit short enough that the orders can be separated by the cross-disperser.
That should produce something like that shown below, if you illuminate it with a continuum source. Exactly what you see will depend on the dispersive power of the cross-disperser (should be low and often, prisms are used), how large your CCD is and how long your slit is.