KP
I got LPM to send me one not drilled. I have played with it a bit to try and take the reliefs out. At fist I thought it would be a piece of cake as it was very flexible with a little heat from my heat gun but this stuff has a very elastic quality and it's hard to make it stay in the desired contour. I have come to the conclusion that the only way to do it would be to make an inner and outer mold for each corner, heat the material, sandwich and clamp the piece in the mold halves. Probably not a big deal, I have just been a bit too busy. Remember, the reproductions are smaller overall as well. (not sure about the Yamiya)
As you know I'm trying to finish my original early 2 hole box as well. I just need a good center piece so I can get the right contour on the lip etc. I watch Ebay 10 times a day at least for air boxes. If I find one I'll either buy it for you or let you know right away.