PLEASE READ - > http://castboolits.gunloads.com/show...o-skin-the-cat
it will answer A LOT of your potential questions.
There are links to Wymans build thread.
Lead melting depends on you alloy.
Below is a graph that shows different material mixed with lead.
If you have a high enough TIN ratio your alloy could melt as low as 361 degrees F
Once you finish reading the thread I listed above and the corresponding links feel free to contact me. I will be more then happy to answer your questions and point you in the right direction.
Wyman listed all the parts needed to build is setup (minus the automated panel)