Something on economic cycles before central banking might not be a bad idea. According to Thomas Woods, there remains a lot of work to be done by Austrians in this area, at least insofar as US history is concerned.
You might also do a short history of modern trade from a free market point of view, to counter Ha Joon-Chang, Noam Chomsky, Pat Buchanan, et al, who say that developed nations grew properous only because they rigorously protected their industries.
What about the origins of money? David Graeber’s book argues that systems of trust-based credit, not barter, preceeded commodity money as a medium of exchange, which itself was used prominently in times of state violence. An Austrian counter or reinterpretation might be useful.
I would personally really like to see a libertarian take on the Triangle Shirtwaist Factory Fire of 1911. All the literature I’ve seen on it has a strong statist bias (as does most history, in fact). In my history class, this was the big stick with which laissez-faire was beaten; we can’t have a free market, just look at how many people died before labour laws! Someone on these forums was speculating that the only reason the owners moved to a loft was because regulations increased the costs of working in factories. If you could look up old newspapers and read the court documents and provide a scholarly undergirding for this view, that would be a great achievement for our side.
Also, why not submit your work to the Review of AE or the Quarterly Journal of AE when you’re done?