ThanksRemoving the body? What makes you think you'd need to remove the body to replace fluid? As Rich said you could simply use a flat plate attached to the side of the tubing for mounting the reservoirs like I'm showing here:
Keep the top of the caps at or below the top of the square tube and you'll be good.
I've seen pics where it looks like part of the reservoir cap sits under the body and wanted to make sure that a bleeder cap wouldn't get in the way.
I haven't seen many Cobras in person and hope to see plenty at LCS this year to get some ideas and pointers on my build.