Unit HPs, damage output, etc are very hard to calculate. The differences in damage type and different stages (before upgrades, after upgrades, unit with 2 stars, etc) make computing this data VERY difficult. I have seen others try to post on their findings but their attempts were flawed/inaccurate.
Most of the info on my spreadsheet can be found with a few hours of research. The data that most are interested in are the exp point value units/structures are worth when destroying them. EVERY multiplayer unit can be found on my spreadsheet with the accurate exp point value if you are still trying to rank up to General. Hopefully tomorrow I will finish with the unit/structure build times and call this spreadsheet nearly complete.
It would be great to make this post a sticky so that players can use this spreadsheet as a reference.
HALO WARS SPREADSHEET= http://spreadsheets.google.com/ccc?key=0As1fxbtzJycSdFhzdkZVMmY2ckp1OElXbVdHaG5JT1E&hl=en
CHECK IT OUT!