The same guy built mine. Quality was ok but did have a problem with the shallow kenwood I asked for (none in stock) but was supplied with a JL instead.
I made one and gave up. Really couldnt be bothered! Sounded rubbish and for the headache and materials it wasnt worth it for me.
Sounds awesome!
Hidden the amp in the rear quater panel also.
Looks good I was really after one that doesn't encroach quite so much into the boot - Bit like this one;

and I was looking at mounting the amp on the other side, but behind rear panel is also an option I hadn't thought about...
Just a pity he was/is such a "Tool"