I actually used completely different printed parts, but the concept is the same. I plan to completely redo the door because, as you can see, the current configuration isn't doing to well.
does it help with keeping the sound down ?
Very much so. The sound was reduced even more when I sealed the edges (but not the door) with duct tape. The rubbery mat underneath helps too.
Looks good, I'll try to make something similar before the wife throws it out of the window ;)