http://www.megasquirt.info/ have a look in tehre mate
yes there is loads of soldering mate plus u then have to buy a stim to make sure its working bla bla bla i would get 1 fully built and tested for that extra £40

have alook mate if you like i can give u a number of the guy that actualy made mega squirt extra code so he knows wt hees on about

tommy