How to mount TT shifters and TT brake levers together? I am starting a new project to build a custom bike with bullhorn handlebar. It'd most likely be made either with road or hybrid type of frame. I am planning on having both front and real derailleurs, and brakes (writing all this because, you know, fixies :) There are many unknowns/choices (obviously!), but I am really struggling with one detail in particular: shifters and brake lever mount to the bullhorn handlebar. I was searching a lot and came across this bike: 

This is way aero for my taste, but check out that brake lever/shifter combo on the right side of the handlebar. Does anyone know what these components are? I searched Vision's site, but couldn't find TT brake level with opened top to which TT shifter could be mounted. And the lever doesn't look to be crosstop one; so I am really confused.

Does anyone know how can this be done? Thanks!
I can't tell for sure what's going on in that picture, but I think it's a modified older Vision lever that clamps on the OD rather than inside the bars, and then the shifter is just stuck out the end. Ways of doing it with off the shelf parts that I know of are the Jtek Aerobrake, Ultegra ST-6871 and DA ST-9071, the Record and Athena tri/tt EPS levers, and SRAM eTap blips (their equivalent, kind of).