You could probably make a pretty good wood frame with some patience, though the extruded aluminum is likely going to be better. Also, I'm not sure how wood prices are in Italy right now, but in the US where I live, it might cost nearly as much to make it out of wood as it would to buy that one. An aluminum frame has a few advantages: the screen is manufactured to fairly precise dimensions; aluminum won't warp if it isn't sealed properly, and it should be straight right out of the box; it is lightweight and very rigid.
As far as the material goes, many manufacturers sell material-only options, so you could pretty easily change out the fabric later, or attempt to make your own to fit. I'm not sure whether this particular company provides material-only options, but all of the companies I have bought from do.
As far as the material goes, many manufacturers sell material-only options, so you could pretty easily change out the fabric later, or attempt to make your own to fit. I'm not sure whether this particular company provides material-only options, but all of the companies I have bought from do.
