two questions

[TECNOMODEL]

What do you mean, "help to insert constraints"?? Do you have a lot of pieces ahead of what you have to bind and therefore bother you in selecting faces/axes/points of the components behind?? or in the axieme you want to change color to the piece (so put it in transparency) because so you can see constructive details that would be hidden with a normal color?

It would be convenient in both cases.
Moreover for my habit always use a transparent display even only in part modeling, for example to see if 2 holes cross etc.
If there was a way to create a display style in which to set the appearance in transparent would be a great thing.

Does anyone know if it is possible to do so?