not a guide as such, i take it thats its to secure a sub?
i decided on the position of mine, as shown in the pics, then made 4 pieces of timber to fit, a big section that the amp is mounted on, a long stip running down the front of the boot, and then 2 smaller bits fitted next to the sub box and inbetween the longer one, see the paint drawing...
i did it in parts because then i could easily get to the spare wheel, and i was the only one who knew how to get it out!
once the bits fit etc i rounghly cut the carpet to the shape of the boot, whilst have a good 3 inches overhang, then tucked it under the sides, this made it look perfectly fitted and tidy, even if it did take some time getting the creases out.
hope that helps, drop me a pm if you need any more info mate.
sorry about the poor paint drawing, just a quick one to show you how i set it out.
Boot 1 :
http://i104.photobucket.com/albums/m195/clio_peps/DSC00239.jpg
Boot 2:
http://i104.photobucket.com/albums/m195/clio_peps/DSC00240.jpg
paint:
http://i104.photobucket.com/albums/m195/clio_peps/boot.jpg