John, Thank you, you're very helpful!
Unfortunately, I don't have an Estab for the Japanese Forces, but attached is a Microsoft Excel Spreadsheet showing a typical Japanese Force Structure.
Each successive tab in the spreadsheet builds from a Japanese Squad up through Army. I used it to calculate manpower requirements for building an old scenario depicting the Battle of Saipan in 1944.
The manpower numbers and weapons information is not necessarily what you need as the Japanese Army morphed from the structure of 1942 to the 1944 era which I used as a basis for the spreadsheet.
If you're interested in building a scenario, I'd suggest starting with the map, for Guadalcanal concentrating on the northern and western sides of the island, where most of the critical battles took place. East and West the island should be depicted from Cape Esperance to just east of the Tenaru River, and then as far south as Mt. Austin to capture most of the battles on the main island.
I had looked into building a series of scenarios on the Guadalcanal Campaign, and determined that after building the map, I'd need to break it into smaller pieces both because the campaign time far exceeds the duration of any Command Ops 2 scenario, and because Guadalcanal wasn't a constant stretch of battle over that period.
As you build the map, you'll get a good idea about how to break it up to address the various high points in the combat during the campaign.
I'd suggest enhancing your information on the battle with information from this site:
http://www.ibiblio.org/hyperwar/
It provides a significant amount of readings on the history and operations in World War II, broken down between the US Army operations and Marine Corps operations and highlighting various aspects of the campaign ranging from strategic services to soldier stories of combat. Embedded in the narrative is a good description of US Force structure, and enough information to cull a Japanese structure for the era you want to model.
If you want to exchange information, perhaps draw some interest from other users, and keep all your information in one place, I'd suggest you start a Guadalcanal discussion in the scenarios forum.
Hope this helps.