hi there
I think "BHD" would be a very interesing topic. Even more since there are the rangers and deltas + littlebirds from BAS to realize it.
I also think that it is nearly impossible to realize "BHD" in one mission; the events back in '93 have been all topsy-turvy you would need like 1.000 somalis about 170 rangers + deltas, 5t Trucks, Hummer, Littlebirds and, ah yes, black hawks, obviously...
The key to bring "BHD" alive in OFP is consequently not to make a mission but a campaign. Just like in Bowdens book. The Author's story isn't one continuous flow of events. Instead it is devided several chapters, each telling you a distinct story that is interlinked with all the other chapters. All chapters together build the story of "BHD".
So IMHO "BHD" for OFP shouldn't be a mission but a campaign. Each mission within this campaign gives you the opportunity to replay certain elements of the desaster (eg. secure and hold the position around the target building with your chalk; evacuate wounded ranger with an Hummer; storm target building with delta; lead convoy through streets &c)