sievenpiper structure design file requested

Hi, I have Sievenpiper's thesis. Are you looking for the design of the structure that is described there? (3D hexagonal)

I have his thesis. but I can't find detail discription how he simulate the structure. I want to repeat his result. But from my simulation. It sounds there is convergence problem. Also I am confused for some modes there are strong component in imaginary part, does it has real physical meaning?
thx!