Usually PCBs and plates will be universal between ISO and ANSI, it just a matter of which hole you solder your switches into.
Your choices for full size are fairly limited and pricey. GON keyboards has a full size called the NerD 108: http://www.gonskeyboardworks.com/pcbs-and-controllers/78-nerd-108-pcb-ver15.html
Another alternative is to get a custom cut plate and then handwire.
Use keyboard-layout-editor.com to generate your layout (there's a full size ISO preset) and then http://builder.swillkb.com/ to generate the plate shape and order it from Lasergist.
FreakOut._. reacted to geo3 in Need help with my DIY Keyboard
