Bigun, If your talking about chopping a hole out the boot to be able to get at the fuel tank stuff then the first thing to do is make a trip to a scrappies to chop the boot floor out of an old 'A' series LWB, you then use this as your in fill panel as the moulding will be correct to fit the moulding of your boot floor. The bit you cut out on your car won't fit, it will just drop through the hole, it needs to overlap the hole by a good 20mm all round so you have enough room for the screws and instant gasket to make a seal.
Cutting it's the easy bit, just don't cut to deep otherwise you will cut lumps out of the fuel tank and hoses. You can see the top of the tank if you look underneath the rear wheel arches, it's not too difficult to slide a piece of ply in there to protect stuff while cutting.
This posting may have been helpfull, on the other hand probably not... Either way, I may have had drink when posting it in which case it's probably not as helpfull as it could have been
Work safe, and remember all technical problems can be resolved with a hammer, the trick is knowing where to hit it and how big a hammer to use (I often find it may also help to have a spare bit in the shed to replace the bit you have just mullered

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