Ok so I just won this cab on ebay, doesnt look amazing but I'm thinking it cant be that hard to add a grille cloth?

The only thing I'm worried about is how to mount it as obviously you cant have the grille too close to the speakers. Doesnt look like theres loads of room from the speakers and the outside of the cab though, how close should the grille be to the speaker?
My idea so far is as follows - basically make a small frame which fits the measurements of the inside of the "lip" around the baffles, which I can then staple or whatever the grill around and then get some brackets to mount the grille/frame onto the cab? Or is there a simpler way?
Finally, wheres the cheapest place to get some silver Fender style cloth grille, like on the HRDx series? Matamp have some on their site but dont say how much..
Cheers!