Cathedral port flange/plates

I'm looking for a set of aluminum plates to mount a custom intake manifold to cathedral port ls1 heads, as-in cnc machined aluminum plates approximately 3/8'' or .375'', i going to valiantly attempt to mate two sets of GSXR Independant Throttle Bodies to these plates with staggered crossflow runners and build an ITB manifold for my truck. could be messy but it worth a try and the gsxr ITBs are cheap on ebay and at selvage yards. so why not?

if anybody can make these plates i'de love to have them