Seems to be a lot of triple carb questions lately. Here are some pics of my Weber set-up and hand-made linkage. I am by no means a machinist, but I had access to some hard aircraft aluminum (7075), a bandsaw and a grinding disc to get the shape I wanted. The linkage rod is 5/16 stainless rod with the stock Z U-bracket welded on the end, so I could use the stock setup from the firewall. The uprights and links to the throttle plates are Heim joints from a local speed shop.

It was custom made. the intake is a 4" very tight K&N cone

Triple with air box

I tried very close to what you have-different filtration setup, but the acrylic kept deforming(South Georgia challenged A/C and plastic under the hood!).

Will