Not at all! I bought a pair of G4338 grilles a few years back because I didn't feel like making my own. For some bizzare reason both showed up a week later and in perfect shape. I liked them so much I went to order a second pair and they were NLA so I ended up building four round grilles for my 1500AL's instead. Now I think the 4338 grille is available again.
I've actually considered building myself some HTPS400's several times, I just didn't feel like spending something like $1,500 on a pair of the twelve inch drivers. I have no idea why those particular twelves are so incredibly expensive, that's very nearly 1500AL territory. Someday I might ask.