Heh, thanks for the comments.
Reminds me I must get piccies tomorrow if the weather is good

You will NOT be able to get any decent level of bass from speakers in the doors due to the way they are fabricated and in general the size of the speakers.
What you can fit is 10cm speakers in the lower forward areas of the door without major modification. However if you look at my project build you can use 13cm speakers higher up but will need to remove some excess door metal and be careful of the window glass clearance...also you may well need to create your own door card to take the extra weight.
In short:
10cm = Easy
13cm = Hard and not overly worth it unless your going for something LOUD
What I would advise as a fairly simple but nice set-up:
Front doors: 10cm speakers
Rear quarter panels: 13cm speakers
Rear of van: 12" active subwoofer
Have your headunit to supply the audio, a separate amplifier for the 13cm and 10cm speakers front and back...and the sub woofer has it's own amp.
Nothing over the top and would give you a good set-up... though if you want to go loud drop me a message for some interesting tips such as the fact that it is possible to have a system more powerful than the vans alternator can supply...but by that point it is pretty damn loud
