Do you have a schematic/BOM/picture(s) of the build? I'm a mechanical engineer with modest electrical experience, but I can read a schematic (more or less) and screw down wires to a terminal block :P
Any help would be appreciated. Also, I have access to a (free) laser cutter at work. I believe...
Bräu SV240 EZboil - 240V Electric Brewery Controller for $410
http://brausupply.com/products/unibrau-controller-240v
Similar to Auber's EZboil tabletop http://www.auberins.com/index.php?main_page=product_info&cPath=8&products_id=533
Looks like it's capable of slightly higher (4800:5500)...