Fitting speakers with large magnets

[Iceman299]

I had a go at fitting a pair of component alpine speakers which are currently in my celica.
The depth doesn't seem to be an issue as it's only an extra 1cm over stock.
The problem i have is the magnet is too large. 

Has anyone cut away the door skin approx 5mm around the circumference of it? Or would that be a bad idea?

Also, where is the best place to get an amp power cable through the bulkhead. I've read most people drill a hole, but where would be best?

Thanks