I have looked through a few pictures to jog my memory & the blade still seems OK, the cross section should be a broad diamond. There is a ridge along the central spine.
The Qin swords were more angular, and complex in cross section.
They could have done the crossgaurd in a more classic fashion though, such as the jade examples here.
Bronze would be cheaper and commoner as an alternative but the shape is the same. This can be seen in Tang swords and even into some more traditional later jian.
If the crossgaurd design they use is authentic or not I dont know. For the pommel to end in a flat circular head is correct. That is a pretty common form from earlier times, again a jade pommel would look good though and some examples are quite decorative.
Bronze sword fittings are shown in Tony Allens book, decorated. They sometimes can be found for sale (originals) but with such a long history the dating loose pieces is difficult.

this example is from a Han sword just over 1m long. The picture seems to show the cord binding which often must have been rougher than the modern version, and even traces of some other organic material like fabric can be seen on the blade. (from Yang Hong)
This example was excavated near Jingdii's tomb and shows the same triangular edge facing the blade...and a mythical beast.
There were such fittings on the scabbard also..although jade would not be on anything other than a priveledged individuals weapon.

This is a fake of mine....a modern blade segment made to look old and a very nicely carved (modern) jade fixture.
Still gives the idea of what their modern swords could add to the items to make them look like a glorious Han era blade.
They could get these fairly cheapily I would expect and it would look much better!