This is my GURPS Byzantine Project. There is a large problem getting published when the place you are applying in have no resources even to answer your queries. A friend told me that waiting for 4+ months to a year for an answer is the standard for the publishers. It may be the case but it is still no excuse, IMO, for anyone to wait for an answer. 4 months is too much time, what more a year... at least there are blogs.
I'll be posting my research concerning GURPS byzantium and its game implications here. Basically, information that would suffice to run a grounded GURPS byzantium game without breaking any copyrights.