Amp Frame Assembled

I made my lovely aluminium frame for my amp project. It fits perfectly in the wicker box. Sadly, the subwoofer plate amp that was to be mounted inside it doesn't fit by 3mm. I'm loath to cut the frame as I only have hand tools and it seems like a lot of work. A least the 8+ smaller 50W amps will fit comfortably, as will the controller beagleboard and display.

Here you can see how it slots into the case: