This page has a similar setup to what you want to do.
http://www.woollypigs.com/2009/11/lh...y-handle-bars/
I was going to do this to a touring bike I have that currently has drops. I bought most of the components I would need and then found that the levers didn't fit on the side sections as I wanted. There were two issues, firstly the Shimano V brake levers I had wouldn't fit around the corners of the trekking bar. Secondly the side section only had a very short straight section and hence it would be difficult to get the levers far enough forward without the clamp being on the forward curve section resulting in the levers angling out.
I think it is very dependent on the model of levers and bars you get. Also trekking bars are wide so it depends on whether you want your hands that wide. Another similar setup could be bullhorn bars.