http://australia.rs-online.com/web/p/pr ... 4E4F4E4526this is the PSR you want, you need to check that 25 amps is enough for 4800watss in your circumstances
they spec sheet has the pot you need, talk to RS via phone to confirm the right one
i used a 2nd hand heat sink from a PC motherboard and also a PC fan from my shed
i used a mobile phone charger to run fan from my shed
power cable and plugs from hardware or electrical wholesaler
power on light from jatcar etc (or other)
hobby box - i used tupperware type thing from kitchen
amp meter - i dont have one and am unsure of best model
have a good read back over the thread and look at the pics, they are fairly simple.
i cannot tell you how to build it really as if you die using it then your estate might sue me.... better to get a sparky / elec tech to help you a bit
my posts are purely for information only.... seek professional advice thats my disclaimer :)
oh and welcome to the site, forgot to say that before. (i am a ride prick :D )