Eric Bruning gave a good talk on this kind of stuff last year at SciPy [1]. His primary work seems to be focused on 3D lightning mapping using VHF antenna arrays - a slightly different approach than trying to take simultaneous pictures from multiple locations, but you get many more datapoints, especially in west Texas [2]. The downside is, you aren't getting a "true" 3D model of a single strike - rather, a 3D model of a storm based on the samples generated from the mapping data (IIRC)

[1] https://www.youtube.com/watch?v=0Z17Q22HEMI

[2] http://pogo.tosm.ttu.edu/about/